Cal Lightman and his team assist federal law enforcement in the specialist field of lie detection. Lightman turns his talents to solving a teacher's murder.
When Lisbon and Jane look into the murder of an army medic who helps rehabilitate veterans who have suffered mental injuries, their primary witness suffers from severe amnesia.
Everyone around Christy tests her patience. Bonnie comes face-to-face with a former rival.
Leonard, Sheldon and Wolowitz file for a patent on their new invention while Penny, Amy and Bernadette give dating advice to Koothrappali after his breakup with Emily.
As the NCIS team investigates a teenage girl's abduction, Ziva and Abby work closely with her young friend, who witnessed the kidnapping.