Stellan Skarsgård stars as John River, a brilliant police officer whose genius and fault line is the fragility of his mind. He is a man haunted by the murder victims whose secrets he must unlock, a man who walks a professional tightrope between a pathology so extreme he risks permanent dismissal, and a healthy state of mind that could cure him of his gift. Created and written by Emmy and BAFTA winning screenwriter Abi Morgan, this enthralling thriller pushes viewers' expectations of crime drama in bold and unexpected ways.