A sniper kills two recruitment officers, leaving behind a unique calling card whenever he strikes. Using himself as bait, Gibbs tries to flush him out.
Mike finds Zach holding Susan hostage; Lynette interviews for a position at a top ad agency; Rex's mother arrives for his funeral; Gabrielle, feeling guilty, visits Carlos in jail.
In an attempt to escape their sordid past, a therapist relocates his family to the other side of the country. Unfortunately, their new home has its own inescapable problems.
Bobby Nash moves to Los Angeles in the wake of a devastating family tragedy, and becomes captain of the 188 as well as meeting Athena Grant for the first time.
Gunshots, a fleeing van and a massive pool of blood all point to murder, but when Castle and Beckett arrive at the crime scene, they discover that it's lacking something, a victim.
