'Broadchurch' creator Chris Chibnall has revealed a spoiler for the show's second series.
The TV writer and producer - who, until now, has always kept the secrets of the programme under wraps - asked author Erin Kelly to put in a secret about series two in the novel adaptation of the ITV drama show which he commissioned.
Erin said: "About three days before we went to press, Chris put in one tiny little clue about something that happens in series two.
"He asked me to add it in, literally just as we had the proof all laid out ready to go to press.
"It's something only the die-hards will pick up on but there's one line quite early on in the book that won't make sense to anybody. It's something very playful that he did right at the last minute."
Erin also admitted she is looking forward to seeing if anyone notices the spoiler in her book.
She added to Radio Times magazine: "It doesn't give anything away but I'm sure it'll get people talking. I'm going to be checking out the chatrooms to see if people have picked up on it."
The BAFTA award-winning show - which stars David Tennant and Olivia Colman as DI Alec Hardy and DS Ellie Miller - is expected to return to our screens in 2015.
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