The team struggle to find any physical evidence of a crime after a computer expert claims she witnessed a sailor's murder in the apartment across from her. McGee senses there's more to the story.
The murder of an English tutor unearths a plot to steal a priceless artefact from the British Museum. Meanwhile, new CBI boss Madeleine Hightower arrives at HQ and immediately lays down the law.
Lightman is hired by a wealthy woman to do a background check on her new boyfriend, so he digs deep into the man's past to find out the truth about this social chameleon.
Nick and Warrick investigate a fatal paragliding accident; a murder seems to be the escalation of an argument between neighbours.
Phoebe and Paige's search for Leo leads them to the mythical island of Valhalla; Phoebe discovers she is an empath, and begins to come to terms with the repercussions of her dangerous new power.
