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https://www.youtube.com/watch?v=imTyEPCAbc8
Puzzle setter John Ludwig Taylor’s (David Mitchell) life of solitude is upended when his identical twin, DCI James Taylor, disappears.
Drafted in by his sister-in-law Lucy (Anna Maxwell Martin), John reluctantly assumes his brother’s identity as a detective in the Cambridge Police Authority in order to find clues to his brother’s whereabouts.