Gibbs and McGee head to Alaska while the team works at home to uncover the conspiracy behind the serial killer.
When one of Lola's former murder cases is overturned on appeal, Mark helms the retrial and struggles to keep the bomber in jail, while Lola fears she may have prosecuted an innocent man.
As Dave finds himself sucked into a serious relationship with a woman he doesn’t like, Alex searches for a roommate and Penny finds a flamboyant friend.
Melinda is bewildered when she deals with the ghost of Jason Bennett, a man who died 10 years prior before his high school graduation.
Veronica catches Tim Foyle breaking into Mars Investigations; Keith questions Mindy O'Dell and makes an arrest in her husband's death; Wallace notices Logan and Parker having lunch together.
