A series of child abductions mean Cooper and his Red Cell team are called in to investigate who could be behind the crimes.
When Jane is kidnapped, Lisbon and the team delve into the past in the hope of finding a suspect, only to find that their colleague has an extensive list of enemies.
A man who claimed to be an alien abductee is found murdered, but the hunt for his killer is hampered when the man's corpse disappears from the coroner's van.
The detectives are on the trail of a team of off-road racers who have their sights set on taking out a fellow competitor for good.
While searching for a serial letter-bomber, Don and Charlie disagree over whether a previously suspected bomber is responsible for the latest murder.