Billy Harney is the son of Chicago’s Chief of Detectives, and he followed in his father’s footsteps. His twin sister Patty is also a cop. Billy is involved in a shootout and left for dead, but amazingly survives. Now he’s charged with a double homicide and desperately wants to clear his good name. The problem is, he has no recollection of what went down in the hours preceding the events. He puts his detective work to good use, and finds a little black book that everyone in Chicago wants to get their hands on. He is happy he found the book because it will help him solve the case, but at the same time he is afraid that the truth might not set him free.