Glued (S01E12)

Lieutenant Stillman asks Rush to investigate the 1980 unsolved murder of an 8-year-old boy. Stillman worked the case and is still haunted by it. Initially, the team focuses on a local thug who quickly moved away after the killing. Then the victim's mother becomes a suspect. The detectives question a former neighborhood priest, who is now retired, and realize the priest heard the killer's confession but refuses to divulge the identity. Rush concocts a scheme to get the murderer, a former drugstore clerk who is now a successful businessman, to confess. (Warner Bros. UK)