His family having moved following their ordeal at Michael Hawkins' hands Creegan is deemed fit to return to work but both he and Susan are resentful of bright new colleague Martin Simmons, brought in to replace the slaughtered Rivers. A charred corpse is discovered in a disused mental home, bearing the mark Y Me. A second murder occurs committed in the same way and again Y Me is the motive. The victim was last seen in the company of her boyfriend Andy, according to her baby-sitter Lynn Southy and he becomes the prime suspect. (thetvdb.com)