Another Life: Frost returns after his suspension and is faced with a complex murder case. While one victim is leading a double life, another dismembered body turns up with two left feet and one of them isn't his! Frost will need all the help he can to crack these baffling cases. Dancing in the Dark: A man's body is discovered at a recycling plant with no ID, save a gold tooth. Frost ivestigates but can't seem to match him to any missing people. Next, the body of a female escort is found in the hotel room of a wealthy man who commits suicide prior to his arrest. Frost tries to find the link between forged passports and illegal immigrants from Poland. Near Death Experience: Sergeant George Toolan is seriously injured as he and Jack try to prevent a young man's suicide attempt. A ritualistic murder echoes a previous case and when another woman is murdered, it seems as if it's a direct challenge to Frost. The serial killer covers his tracks, but Frost finds a mistake that leads to vital information about the murderer's next move...and his next victim.