In 1996 a gunman opened fire from the top of a multistory carpark killing passersby on Whitewater High Street. Since known as the Whitewater massacre, one of the victims was a tactical squad police officer, Sgt. Nick Pat…

探长Peter Boyd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未破获的老谋杀案。