Handsome challenger, James Holbrook, takes out the jackpot, all the prizes and £1,000, on the popular TV quiz show Game of Champions and is then found dead from what appears to be a heart attack. However Chief Superintendent Matthew Lawson and Dr Lucien Blake find evidence of sabotage.
When the locals make deaths threats against a suspect, Blake takes him home like a lost animal, much to Jean's annoyance. Simon tells Blake every detail about the patterns in people's movements on the quiz show, giving Blake useful insights. The number of suspects is growing, as are the motives.
Dr Blake turns to Jean, Mattie and Daniel to help him make sense of the baffling case. He gets them to role-play a whodunnit version of the quiz show with a surprising answer.