Castle and Beckett investigate the murder of a plastic surgeon. Meanwhile, Alexis has her first prom and Castle snoops around Beckett's past with surprising results.

Beckett is called in to work with the FBI when a 2 year old girl is missing. Castle vies for Beckett's attention when he finds out that the FBI Agent in charge of the case is Beckett's ex.

Castle and Beckett investigate the murder of a woman found drowned in motor oil in a motel bathtub. They seek the help of a true crime journalist who might have a connection with the victim.

Beckett and Castle investigate numerous cases involving murders and home invasion jewel heists.

Castle and Beckett look into the Vudon religion when an immigrant is found tortured in a ritualistic killing. Meanwhile on the homefront Castle must deal with the possible homecoming of Alexis' mother, his first wife.

Castle and Beckett investigate the murder of a women found frozen and tangled in steel bars at a construction site. The case leads them to looking into an old case and also has Beckett thinking about some memories from her past.

Castle and Beckett work together to solve the murder of a nanny found dead spinning in the dryer of an upscale New York apartment building's laundry room.