The slaying of a couple in the Witness Protection Program involves Detectives Goren and Eames as they suspect someone tipped off the murderous clan that seeks vengeance for their testimony -- but the cops discover the victims' surviving daughter and her relationship with her birth father is the missing link. Their investigation reveals that the biological father has a jealous wife and a longtime secret girlfriend -- all of whom have hidden agendas and evil intent.

In the bloody wake of a multiple suicide pact gone wrong, Detectives Goren and Eames consider the deaths of four young adults who parked their car on railroad tracks and waited for the inevitable . And while the cops probe a "suicide matchmaking" website, they discover that one of the victims tried vainly to escape. Backtracking, the investigators seek to learn what brought the four together that night, and they wonder if office politics and an illicit romance were factors in the tragedy -- and subsequent coverup.