Cassidy's life is in danger after she comes face to face with a hired assassin who gunned down two men involved in creating and marketing synthetic diamonds; Joe takes a private case involving a stolen wine collection that is being held for ransom; Joe tries to back out of the house purchase; Cassidy and her new partner Rachel McCabe join the S.I.U.

Nash pursues a group of modern-day pirates who target and rob wealthy partygoers; a nun, who claims she's a virgin, says her pregnancy is a miracle; Joe goes to extreme measures to catch a speeder on his street.