Professor Jasper Tempest (Ben Miller) precisely calibrates and structures every aspect of his life. Impeccably dressed and meticulously punctual, he lectures daily at the Cambridge Institute of Criminology, teaching students imaginatively, if pedantically, about the science of crime. And each evening, he returns home to his apartment, which is as sterile and systematically ordered as a science lab. With this strictly regimented approach, his OCD and germophobia are under control. But, his buttoned-down world is slowly undone when he is persuaded by one of his former students to assist in investigating a serial rapist. While his encyclopedic knowledge of criminal psychology and his brilliant mind prove invaluable to the team, the cracks in his carefully constructed emotionless exterior begin to show.