In an Australian university, Aidan is attending his philosophy class. Mr. Wertz asks everyone why
they think we are here, and there's a variety of answers from students, from religious perspectives
to the scientific explanation of atoms. Aidan though doesn't have much to say: he believes
in the unknown and in the fact that they'll never know for sure. Mr. Wertz doesn't like this nothing
of an answer and changes to what happens after death, so Aidan answers he thinks we've all been
dead a lot longer than we've been alive. Then, Mr. Wertz makes them turn over the papers he gave
them early, where only one exercise tops the exam page with a simple question: "why?". After class,
Aidan goes to get his bicycle in order to go home, and he's shocked to be suddenly approached
by a man that looks just like him, including the same clothes. This man tells him not to go
to the Heathscape motel, then he just runs away. Aidan tries going after him but loses sight of him
before he can catch him. Afterward, Aidan returns home and tries to tell his roommates Nick and
Jess about what happened, but they ignore him and keep talking between them. Later in the afternoon,
Aidan goes to visit his grandma at the retirement home, where Aidan gets a call asking for a middle
name before he quickly hangs up. Then, Aidan tells his grandma about the exam and the fact
something weird happened to him, but grandma promises there's no history of mental illness
in the family. Aidan's grandfather died in a golf accident from drowning in a lake,
and she misses him terribly. Speaking of special someones, grandma wonders when Aidan
will propose to his girlfriend Lauren, but instead of telling the truth and confessing they broke up,
Aidan tells her they're thinking about it before he grabs a book to read to his grandma
as he always does. Later, curiosity gets the better of him and Aidan decides to visit the
Heathscape motel, where he's shocked to find out Lauren is the receptionist. After swearing this
is a coincidence, Aidan asks her if he's been there before, but she responds he hasn't. Their
conversation is cut short by the motel manager, so Aidan leaves the building not to get Lauren into
trouble. He doesn't return home though, he waits outside until her shift is over to invite her to a
nearby diner. There, Aidan tells Lauren the story behind him coming to the motel, which she isn't
sure she can believe. They share some news about their current lives and have dinner while ignoring
the noises of someone falling to the floor and dropping a bunch of stuff. When they're done,
Aidan offers Lauren to give her a ride, which she accepts. Night falls while they're on the road,
and Lauren decides she must confess something to Aidan. However, before she can say anything,
she notices something blocking the road and grabs the wheel to try to avoid it, but sadly,
they crash anyway. Aidan only sees her bleeding head before passing out. The next morning,
Aidan wakes up in the hospital, and Nick and Jess are there with him. They're acting rather
awkwardly though, and not only because they don't know how to tell Aidan that Lauren died. He's
also visited by a couple of detectives that tell Aidan he can't leave the hospital because Lauren's
family is pressing charges, so a lawyer will come the next day to advise him through the process. In
the evening, Aidan is bothered by Patient X, who wants to play a word game to keep their minds off
things. Aidan turns him down because he isn't in the mood for games, so to get his attention,
Patient X confesses he knows something weird has happened to Aidan. He can't give him all
the details because Aidan needs to figure it out for himself, but he can give him a hint:
he needs to go to the Heathscape motel and find a hole in the bathroom of room forty-one. Aidan
waits for the doctor to do her night check-up and bring him the medicine before slipping out of bed,
changing in the bathroom, and escaping through the stairs. After stopping to buy a rehydrating drink,
Aidan goes to the motel, where the manager has taken over the reception and is talking on the
phone about Lauren's incoming funeral. Once the manager hangs up, Aidan asks for a room and is
given number eleven. He decides to wait there for a while watching the reports of the accident on
tv, and once it's late enough for people to be deeply asleep, Aidan sneaks out and goes to room
forty-one. The door is obviously locked, so Aidan breaks in through the window, finding the room
empty. First, he checks every piece of furniture for any clues, but he finds nothing. Then he goes
to the bathroom, where he finds a fake panel on the floor covering the hole Patient X told him
about. Aidan watches it for a while, trying to guess its secrets, and decides to hide inside
when he hears the manager coming into the room to check why the lights are on. When he comes out a
moment later, he's surprised to find Patient X jumping on the bed, drinking and playing with a
tool. He doesn't recognize him though; in fact he threatens Aidan, ordering him to leave him alone.
Aidan rushes outside and is shocked to see not only that it's already afternoon, but he can also
see himself asking Lauren to go to the diner. It turns out the hole in the bathroom has allowed him
to travel twelve hours back in time. Aidan follows the pair to the diner, sitting a few tables away
from them and hiding his face behind a newspaper he finds around. Without realizing it, he's sat
next to Mr. Wertz, who immediately recognizes his student and congratulates him on his good work
on the exam. He also invites him to the weekly meetings he has with some colleagues at his house,
but Aidan ignores him and tries to leave before they're overheard by his other self. On his way
out, he bumps into a waitress, making her drop her tray, which is the interruption the other Aidan
and Lauren are distracted by during their talk. It is also revealed that during that conversation,
Aidan tells Lauren that he never told his grandma that they broke up, which Lauren finds kinda
weird even if she knows how much grandma liked her. The next moments proceed as future Aidan
remembers them: Lauren and himself get in the car together and leave, so Aidan runs to try to warn
them about the accident. However, him walking in the middle of the road turns out to be the
reason the accident happens in the first place. It's him that Lauren sees and causes her to try
to dodge him. Upset but still determined to fix things, Aidan runs back to the motel and finds
Patient X unconscious on the bed after he tried to end things. Aidan uses the room's phone to
call an ambulance, which would send Patient X to the hospital where he would meet the other Aidan
in the morning. Then, he enters the bathroom hole to reset the day again. This time, Aidan goes home
and tells Nick and Jess everything. Obviously, they don't believe him, so Aidan makes Nick call
his phone. Nick does so, revealing he is the one that calls present Aidan at the retirement
home and asks him for his brother's middle name to be sure it's really him. Jess and Nick are
still skeptical though, and seeing he can't do much to convince them, Aidan asks them to act
surprised when the stuff he's told them about does happen. This explains how awkward they act
at the hospital. Aidan leaves and, after lots of thinking, he decides to try to change things
again. This time, he goes to the road and waits for his second self to appear to push him away,
but unfortunately, the car crash happens anyway. Desperate and unwilling to give up, Aidan grabs
Lauren's body and takes it back to the motel with him to put it in the bathroom hole before climbing
in himself. However, once time goes back to the previous day, Lauren's body disappears. This time,
Aidan decides to go to Mr. Wertz's house for that meeting with colleagues he had mentioned. Aidan
tells them what has been happening to him while pretending it's a novel he's trying to write,
and he wants to hear some ideas on how to help the character fix the timeline. The other professors
think "going back in time to save the girl" is a cliche story that needs some twists,
but they answer his questions anyway. Going back in time shouldn't be possible because the past has
already happened, besides, time doesn't exist in nature, it's only a measurement of movement and
space. Those who do think time-traveling could be a thing have two different theories: some say
time is circular and traveling sends you back to the same point, others think each trip creates an
alternate timeline. Either way, Aidan can't change his own result, at most he could change the future
for an alternate self. Before Aidan leaves, Mr. Wertz confesses that when he was a kid,
he dreamed of being visited by a time traveler that came all the way back to fix his life;
he also reminds Aidan that his character should only go back for the right reasons and
only influence the most important situations. Afterward, Aidan goes to a convenience store,
where he sees a newspaper with an article about Lauren's death. It's here that the detectives
manage to find him and arrest him. Once they make it to the station, the detectives explain
that Aidan's escape from the hospital makes him look like he's hiding something, so he better has
a good reason why he left. While a mysterious person is outside approaching the station, the
detectives hit Aidan to make him confess Lauren's murder. Aidan decides to get cheeky and tell them
about the time-traveling deal, but the detectives don't believe him because then he should've broken
himself out of custody. It's then revealed that the mysterious person outside is another Aidan,
who makes everyone in the station evacuate the building by making a threatening phone call. The
detectives leave as well and handcuff Aidan to a post together with a mentally unstable addict,
who can't stop flailing and accidentally hits a trash can behind him. When the can falls, Aidan
discovers there's been a saw under it waiting for him, thus he changes places with the addict,
drags the saw over with his foot, and uses it to break the handcuffs. Aidan begins running away,
avoiding the road and jumping through people's backyards to try to lose the detectives that are
now chasing him. Eventually, he finds a parking lot and hides under a car, causing the cops to
drive by without seeing him. Afterward, he breaks into a neighbor's toolshed and finds a saw that he
uses to take off the other half of the handcuffs. Then he realizes this is the same saw the other
Aidan left for him, so he takes it back to the motel with him and enters the hole. Once he's
traveled back in time again, he takes the saw to the police station and put it under the trash cash
for the next Aidan that gets arrested. Next, Aidan goes to the diner to have some time to think,
and discovers he's sitting next to Patient X. The man is looking much better and he's even
wearing a suit, but he doesn't remember Aidan. This means he has managed to change his past,
which Aidan confirms when he asks the man about his occupation and if things could've
gone differently for him. Patient X explains he's a lawyer but he almost went to war, and
only a strange incident stopped him from going. He refuses to go into detail about what happened,
although he does still remember the word game. After Patient X leaves, Aidan gets a
call from the retirement home saying his grandma doesn't have much time left. Wasting no time,
Aidan goes to see her, and after grandma wishes her husband could've been here with her, she asks
Aidan to read to her one last time. Later, Aidan visits his grandpa's grave and the old abandoned
house where his grandparents raised him after his mother left him. Starting to have an idea
of what is the right thing to do, Aidan makes a graphic of the timelines to make sure he's got
the math right and goes back to room forty-one. Patient X is there jumping on the bed again,
and this time, he remembers him. He teases Aidan, telling him he can't stop him from using the tool
because he needs him to go to the hospital and tell him about this room in the first place;
you can only influence time but not interfere. Their conversation is interrupted by the manager
coming over to check on the noises, so Aidan and Patient X hide in the bathroom. There,
Patient X explains to Aidan that the trick is to stop the person from being in the situation in
the first place and reminds him that time travels with him before jumping into the hole. Aidan gets
inside the hole as well but this time, after returning to the previous day, he immediately
gets back in to travel even further into the past. He begins doing this constantly, jumping one day
at a time as different guests stay in the room. He only leaves the building a couple of times
to check on important moments, like his breakup with Lauren and their first date. After jumping
through thousands of days, Aidan eventually makes it all the way to his grandparents' young years,
finding his grandpa practicing golf near the lake. The two of them chat for a while,
and then grandpa takes Aidan back to his house, which is still brand new, so he can get his car
and give Aidan a ride. His grandma is also there, looking young, beautiful, and reading as usual,
and Aidan can't help shocking her by quoting something she always said to him. Aidan returns to
the motel after giving his grandpa a gift, making him promise he would only open it the next day.
The following morning, when grandpa goes golfing, he accidentally loses the ball in the lake He
considers jumping in to recover it, but then he remembers Aidan has gifted him a second ball and
uses that one to keep practicing. This prevents grandpa from drowning, and now in the future,
an older grandpa appears next to grandma at the retirement home. Since he can't travel forward,
only backward, Aidan stays in the motel and lets the years pass naturally, eventually becoming the
man known as the motel manager. On the day the accident is supposed to happen, old Aidan visits
the abandoned house again while present Aidan is in his philosophy class, answering the "why?"
question with "why not". When present Aidan leaves the university, this time he's approached by old
Aidan, who tells him to go to the Heathscape motel. Present Aidan does exactly that and
old Aidan watches from afar how Lauren accepts present Aidan's invitation to walk her home.