(dramatic music)
- So, we left Cassie at the end of season three
in quite a bad place.
She has been away from work
because the previous case took
a huge emotional toll on her.
Hello.
You're not meant to be here.
- Yeah, I changed the interview to next week.
- Oh, my love, that is very sweet of you.
Thank you.
- We find Cassie still struggling to recover
from the trauma that was visited upon her
at the end of series three and
the difficulties she was facing
as a result of the 30 years she had
been at the coalface as a police officer.
- I don't want to go back.
I've already given the job everything I have.
- As a result of her brush with the evil
serial killer, Dr. Finch,
Cassie suffered a nervous breakdown of some description.
We don't quite detail what,
but definitely a breakdown of some sort.
And she has gone on a sick leave from the police.
- Well, it's been very complicated for Cassie.
All of these cases.
It's not been so easy to bless and who to blame.
That's why it's such great writing.
I think, obviously, the one that
was most problematic for her was Alex Jennings
because the man was a psychopath and unrepentant.
And that's very hard for her to sit opposite somebody
who was not asking, you know, to be forgiven.
- [Sal] The girls?
- Why would I pay someone to pack
when I've got children I can exploit?
- Wow, do they want to do mine?
- I'm sure we can come to an arrangement.
Listen, I've got to go.
- [Sal] Okay, will I see you tonight?
- Don't know.
I've got a feeling it's going to be a late one.
I'll call you.
And so at the beginning of series four,
we find that Sunny is carrying on.
You ready?
- Yeah, I'm good.
- [Sanjeev] Another case has come in
and he's off pursuing that.
- This year, our victim is found on a scrap heap.
- Easy!
That's it!
Just there, mate!
Hold the work now!
Hold it!
- The body is discovered having been inside a freezer.
Well, that looks very much like blood to me.
Not only is the body frozen,
but it's also missing hands and head.
Morning.
- Oh, Hey, Sunny.
How are you doing?
- Yeah, fine, thanks, Leanne.
- Obviously, it still leaves you three months
shy of your full 30 years.
And I'm as angry as you are.
- Cassie realizes that she's going
to have to return to work
because if she doesn't return to work
and complete the three months that she's shy of,
of her 30 years service,
she won't get her full pension.
- They just won't allow a medical retirement.
And again, I'm so sorry, Cass.
- [Nicola] It's a quite difficult time for her
because she feels she has no choice.
So she has to go back.
- And once again, inevitably and rightly,
gets involved in the case.
- When you find the right vehicle
check to see what else they dumped.
'Cause there might be a second freezer
that has the rest of him in it.
- Still got it.
- The team work out very quickly that
the identity is Matthew Walsh.
- [Murray] Otherwise known as Matt.
- When did he go missing?
- [Murray] He was last seen on a 30th of March, 1990.
- [Nicola] And this becomes a very important date.
- This just came through, which is interesting.
'Cause here you've got Walsh spotted
alive and well just before 11,
and then you've got the guy,
in whose house we find Walsh's body,
stopped in his car just down the road 40 Minutes later.
- With, we might reasonably presume,
Walsh's his body now in the car.
- Yeah, I think if you're a gambling man,
that's a strong possibility.
But that's all fine.
That all fits.
What's curious is when you read the traffic
officer's notes on the arrest,
you'll see that when Fogerty was pulled over...
- Oh wow.
There were four other people in the car with him.
The moment when Sunny and Cassie realize
this case is going to be very difficult and sensitive
comes with the discovery that those
five people were all together on the night
of the 30th of March, 1990,
because that was the day of their passing out celebration.
- He was driving back from a party in Hendon,
a celebration party.
- Celebration party for what?
- Passing out.
- They all trained at Hendon together as police officers.
- Because all five of them were newly-qualified coppers.
- No.
- He was a probationer who just qualified,
and he was crying because he knew...
He knew he just screwed his entire career.
- And that's when the story,
this season's story, really takes off.
We eventually track our way through
to the suspects that we deal with in this season.
And there's something very interesting
about those people that we discover as we go along.
(scene marker clicks)
- Three, two, one, action.
(upbeat electronic music)