Anna and Summer are upset with Seth. Julie has love problems. Sandy helps Jimmy with legal issues. Kirsten's indiscretion is exposed. Ryan and Luke form an unexpected alliance.
When a bar owner's body is found in the East River, the investigation takes Castle and Beckett through the forgotten tunnels and passageways of turn-of-the-century New York; Castle considers buying a bar.
Realizing that she has no memory of sex, Samantha considers re-experiencing her first time or waiting for the right guy.