A young sailor's body is found in an abandoned building on the town's seedier side, and a message written in blood leads the team on different path to find the killer.
The disappearance of a boy forces Dexter to reconsider the Trinity case. Cody stands up in defence of one of Dexter's falsehoods, while the discovery of Debra creates issues for Quinn.
The team investigate the abduction of a married couple whose identity is unclear; Jane continues his search for Lorelei.
Lightman is confronted by a familiar face who wants a debt repayment; meanwhile, the team's services are required to prevent a shooting at a school.
The team question the necessity of the treatments they give a performance artist; House's unexpected actions jeopardise his relationships with Wilson and Cuddy.