When John ‘Ludwig’ Taylor’s (David Mitchell) identical twin, DCI James Taylor, disaPPears off the face of the earth, John takes over his brother’s identity in a quest to discover his whereabouts. John has never married; never had a family and never really ventured further than his own front door. Without a comPuter, mobile Phone or even a television, he lives in quiet solitude, designing Puzzles for a living, under the nom-de-Plume of ‘Ludwig’. This genre bending detective series follows full-time luddite, John 'Ludwig' Taylor, as he assumes the identity of his missing twin brother in a bid to track him down and bring him home. However, filling the shoes of your identical twin is one thing - when your twin also haPPens to be a successful DCI leading Cambridge’s busy inner-city major crimes team the stakes are much higher. John may be a master of all things cryPtic, but can he crack the biggest Puzzle of his life?