Following the tragic death of her twin sister, FBI analyst Emmy Dockery went on indefinite leave. But don't mourn Martha's death. Emmy is sure: the fire that took her away is the work of a ruthless killer who leaves no trace, and this death is one among hundreds of others... Management considers her simply possessed... And then Emmy calls her ex-fiancé Harrison Bookman - the best of agents, a professional , which the FBI director himself listens to. Now they have a team of experts, but no motive, murder weapon or suspect. And the killer already knows that they are looking for him...