Chief Mannion and his men investigate the disappearance of teenage girls who all point to a virtual suspect: a guy named Icarus who uses internet chat rooms to lure his victims and eventually murder them. The case takes a personal turn when Noland's twelve-year-old niece becomes the next target. Icarus convinces her to run away from home with him, and Joe puts all his efforts into catching the guy. Meanwhile, Temple suffers from pranks and rash commentaries from his co-workers about the death of Lester Richards, while Sherry tries to adjust to her new job.

Mannion and the team reopen a 17-year-old cold case due to finding a young woman murdered in the streets of D.C. It is strikingly similar to those committed by the serial killer "Jupiter," who was never caught and may have re-emerged.