Most homicide detectives would rather forget what they see at gruesome crime scenes. Pat Postiglione is not like most detectives. He has the gift of a photographic memory. Coupled with a laser sharp eye for evidence and the ability to detect microscopic clues, Postiglione is one of the most valuable detectives in his Nashville, Tenn., precinct. During his more than 25 years working homicide, he has seen hundreds of crime scenes, and he remembers each as if it happened yesterday. For the first time, he recounts his most daunting cases, walking viewers through the locations in exacting detail. Episodes feature each crime scene re-created based on police records and Postiglione's unparalleled memory.