Amy Rosoff

The CDC calls on the BAU when they suspect bioterrorism is behind a series of mysterious deaths. Also, Garcia visits her stepbrother to take care of a difficult family issue.

When clues in a murder implicate Castle and Beckett's nemesis, Dr. Kelly Nieman (guest star Annie Wersching), Castle is called in to consult on the case. But as the team delves deeper into the investigation, they uncover connections to notorious serial killer Jerry Tyson.

During shooting of a pivotal scene for 'Smokejumpers,' Vince gets contradictory direction from Verner, and Ari and Dana Gordon try to put out the flames. After receiving an unexpected call, Turtle has a clandestine meeting.

When a female soldier charges a commanding officer with sexual assault, Lightman is brought to Fort Meade to find out if there's any truth to the accusation. Meanwhile, the Lightman Group is hired to determine whether the young star of a college basketball team accepted a bribe to play for the university.

Addison can't stop dreaming about Pete; Violet's ex visits her at the clinic, much to Cooper's dismay; Naomi and Sam's daughter seeks medical advice from Addison.