As you know, we MI5 don't have the rights to arrest people. That's why you police are necessary when it comes to put the cuffs on the criminal.

But, why a normal constable like me?

The MI5 could have asked for the cooperation of a detective in Specialist Operations....

There's a reason, of course.

The reason why I wanted to talk to you only, Alice...

...is because I believe there was a person inside the police who has lend their hand to one of the criminals.

S-Someone inside the police is in cahoots with the criminals? That's a seriously accusation, you know. W-What evidence do you have that...

This.