Katherine Kamhi

Brennan and Booth investigate the body of a man murdered for the undisclosed contents of a briefcase. Early evidence leads the team to suspect secret operatives are at work, and their theories are supported when the liquefied remains of a CIA agent are discovered in the trunk of a car. When Brennan and Booth interrogate the CIA's Assistant Director of Intelligence, they are left unsure of his allegiance to the U.S. Meanwhile, Brennan's best-selling book leads to financial success and serves as a point of contention with Booth, and Jeffersonian intern Wendell (guest star Michael Grant Terry) loses his scholarship, leaving the team to look for alternative funding to keep him around.

Booth's detective friend, Ken Nakamura, calls him from Tokyo in a panic when his sister Sachi goes missing in Washington. Booth and Brennan are on the case, and their investigation leads them to a canal where they find Sachi's decapitated head. Booth and Brennan meet up with Ken and trace his sister’s life away from home, and their investigation leads them to an elite escort service. When they discover that her roommate is also missing, they must race against the clock to find Sachi's killer.

A murder investigation reveals a plot to kidnap a wealthy businessman's daughter; FBI Agent Harris (Dylan Walsh) helps Castle and Beckett investigate.

Scorpion, torn apart and uncertain about their future as a team, must come together for their most important mission yet to save Walter's life as his car teeters on the side of a cliff.

With Russell acting as a decoy, the detectives lay a trap for a serial rapist who appears to be murdering his victims so they can’t testify against him.