Law & Order: UK - Season 3 Episode 6 -

The mystery surrounding the stabbing of student, Archie Rahman, has Devlin and Brooks chasing their tails when the only clue they have to go on is a library book checked out on the day of his murder. Two students connected to the book have given an alibi for each other, but one of them is lying. When the perpetrator eventually claims to have acted in self-defence, Alesha is forced to face past demons.