The Behavioural Analysis Unit team investigate a series of vehicular homicides along a dangerous stretch of road at the hands of a serial killer.
After a movie star turned theatre actor is mysteriously killed, Castle and Beckett go backstage and learn the star had more to worry about than just his lines.
When Castle and Beckett discover that the victim of a building fire was actually shot, they get on the trail of a serial arsonist. Meanwhile, Ryan's wife goes into labour.
Castle and Beckett confront the possibility of paranormal foul play when a world renown ghost hunter is mysteriously murdered while investigating a haunting at a legendary New York mansion.
When a bachelor plummets to his death after a one-night stand, the investigation leads to a shocking discovery that might derail Ryan's wedding.