Julian Acosta

While the police suspect a drug dealer on trial is behind the murders of the State's witness in his case, as well as his girlfriend, Patrick Jane sees a different motive for the crime -- as well as a different suspect.

Castle finds himself vying with an FBI agent for Beckett's attention when she is called in to help the agency investigate a little girl's disappearance from her home.

Kensi and Deeks pose as cult members in hopes of rescuing a former Department of Defense employee who was persuaded to reveal classified information.

When a Department of State employee is kidnapped in Afghanistan, Elizabeth takes former Secretary of State Madeleine Albright's advice over the president's recommendation; Henry has a hard time persuading a student to spy for the U.S. government.

The president's administration encounters hostility while dealing with the Russian government; Dmitri is kidnapped and interrogated about being a spy.

When Elizabeth disagrees with the president's response to tension with Russia, she is pushed out of the inner circle; incriminating photos of Harrison and Stevie come to light.