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Jefferson Grieff is on Death Row in an American prison for brutally murdering his wife. But it turns out that Grieff has a gift: he can solve crimes from inside his cell, and that is exactly why English journalist Beth Davenport needs his help. A woman who recently helped Beth has gone missing, with the only clue being a text with a blurry image of a man lunging towards the camera. Will Grieff crack the case in time? And is it really possible to solve a crime before it has been committed?