The BAU heads to Yakima, Wash., after the remains of a dozen people are found along a creek bed; FBI profiler Stephen Walker joins the team.
After a woman discovers that her husband has been murdered, the investigation reveals that the victim may have been living a double life.
While investigating a death aboard a top-secret naval research ship in the middle of the ocean, the team discovers an abandoned ship and a deadly secret.
When Christian's prized possessions are vandalized, he tries to contact the women he has wronged in the past to find the culprit.
Rush and Valens reopen the 1987 case of a high-school basketball star who was stabbed to death hours after leading his team to the state championship.