SHOWRUNNER Steven Moffat, whose CV includes Doctor Who and Sherlock, has pulled another blinder with this gripping new crime thriller.

David Tennant, Stanley Tucci, Dolly Wells and Lydia West head up a spectacular cast for this four-part mini-series, which boasts intrigue, action, moral dilemma and even a thread of comedy.

Tucci plays an American prisoner on death row, seeking atonement as he faces execution.

On a train in England, journalist Beth, played by It’s A Sin breakout star Lydia, is caught up in an incident and is looking for a story.

In a quiet English town, Tennant is the friendly local vicar Harry, picking up his son’s maths teacher Janice (Wells) from the station.

All four are about to cross paths in the most unexpected way, entangled in a dilemma that could lead one of them to murder.

“Everyone’s a murderer. You just have to meet the right person,” says death-row inmate Grieff, who is facing execution for brutally murdering his wife.

The super-intelligent prisoner has become notorious as the Death Row Detective, taking on cases to solve, ably assisted by fellow inmate Dillon (Atkins Estimond), a cheerful serial killer with a photographic memory.

A senator arrives with a case to solve, a mystery that is teased throughout episode one with an amusing reveal at the end.

But Grieff is intrigued by a young journalist who wishes to interview him – and she may have a case for him after a maths teacher ends up locked in a vicar’s cellar.

You can’t not watch until the very end…