The Sinner

What happens when you come face to face with your past - and there's no escape?

Tom Killgannon, ex-undercover police officer and now in witness protection in Cornwall, has been recalled to active service by a local police task force, headed by DS Sheridan.

His mission: befriend notorious child killer Noel Cunningham and find out where he buried the bodies of his last two victims.

The catch: Tom has to obtain that information from within the prison where Cunningham is held.

Undercover and with no back-up, Tom soon runs into danger.

Convicted gangster Dean Foley used to run Manchester's biggest gang, that is until Tom's testimony put him away for life. He recognises Tom, and so begins a cat-and-mouse game as Tom fights for survival before Foley can get his revenge.

But why can't Tom reach DS Sheridan and what is the real reason he was picked to enter Blackmoor prison?