Lilly investigates the 1990 murder of a church organist who was found in an alley surrounded by crack vials and racy magazines.
A prison inmate relates a conversation he overheard to Lilly, leading her to believe the wrong man is serving time for the murder of a 16-year-old girl.
The BAU hits the road to track down a pair of young lovers on an interstate murder spree. Prentiss hears frightening news from her former boss at Interpol.
After a prominent assistant district attorney is linked to a scandal posthumously, Lilly reinvestigates the unsolved murder of the prosecutor, which occurred just before he was to oversee a high-profile murder case.
The team re-examines the 1989 murder of a 12-year-old girl at the home of troubled teen after the strangulation of a young woman near a local swimming spot strongly resembles the case.