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.
After a young actor Mike, (guest star Jeffrey Hephner) is wounded and his fiancee is shot dead on the street, Detectives Goren and Eames are pointed towards the surviving victim's former girlfriend, who is known to have stalked him. The key, however, might turn on their probe of "geocaching," a high-tech treasure-hunt game that could yield vital clues. As the media and public mourn the man's tragic loss, the police want to take another look at some of his acting buddies, especially one who never lets go of his Palm Pilot.