The triple murder of a couple running a restaurant and their son is reopened when it is revealed in court that the man who was originally charged with the crime was robbing a store at another location at the time of the murder.

 in Philadelphia , a homicide investigation team , they face cases not recent , but a few ago or even ten years ago the old cases , such cases occurred in the passage of time , coupled with the parties has been difficult to find a variety of evidence of a crime has almost vanished , so the investigation is particularly difficult this homicide , the image is called "Cold Case ."