A woman walks into the station and confesses to killing someone; the team tries to unravel a bizarre case while dealing with the loss of a colleague.
The squad is forced to work with a private investigator when a clothing designer is found poisoned and his wife reported missing; Jane asks Maura to teach her mother how to handle her finances.
Gibbs' team works with the Army Criminal Investigative Unit to investigate a suspected terrorist attack that killed a Marine colonel at a military country club.
When a body’s found in a theater, Castle & Beckett’s investigation leads them into the unexpectedly dangerous world of competitive acapella.
Mickey calls the Pemberton kids' overly strict grandmother to teach them some discipline; Mickey and Jimmy reunite.