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David Tennant’s murder mystery Broadchurch is being kept a big secret – only 29 people know the identity of the killer.

The ending of the ITV drama starring David and Olivia Colman as detectives searching for a child’s killer has been kept from as many cast and crew members as possible, reported the Daily Mirror.

The murderer’s identity – which viewers will find out tonight – is such a closely guarded secret that only those involved in filming the final episode know who it is. Even ITV executives weren’t allowed to watch it, except for the channel’s boss Peter Fincham and its head of drama.

A source said: “There’s been many clues, but we were determined to keep the intrigue and mystery.”

ITV are taking the secret so seriously that they have not allowed any DVD copies of the programme to be made and there is just one master copy, which is locked away in a safe.

The mystery has been so popular with viewers that Ladbrokes are even taking bets on who the killer will be, with Olivia’s character Sergeant Ellie Miller’s husband, Joe Miller, the favourite at 4-5.

Broadchurch writer Chris Chibnall, who has previously written for Doctor Who, recently said he may return to the BBC sci-fi drama in its next series. “We’ll just see if all the schedules figure out and stuff like that. But it’s always lovely to be on the list,” he said.

Broadchurch concludes on ITV at 9pm tonight (April 22).