Rick Devon's body is found murdered in a park, and his death is automatically assumed to be drug related. Upon investigation, detectives Cyrus Lupo and Kevin Bernard stumble upon a key in a nearby bathroom that could potentially have been left behind by the killer. Prints on the key lead the detectives to former felon, Diego Cardenas, who has cleaned up his act and now works at a home for mentally challenged adults. After questioning Diego, the detectives discover a hidden relationship between the murder victim and another resident of the home, Pete Haynes. Rick and Pete's relationship guides the detectives to uncover a painful family secret that could expose the killer.