Peter Boyd探长指挥着一支经过多种训练的警探和科学家的警察队伍-悬案小组，使用现代的方法和原来调查时还没有的新科技来专门调查的未破获的老谋杀案。 Det. Supt. Peter Boyd (played by Trevor Eve) is the leader of a multi-discipline police team of detectives and scientists, the Cold Case Squad, which investigates old, unsolved murder cases using modern methods and new technology that may not have been available during the original investigation.