Stephanie Bekker's lover is referred to by the police as "Loverboy". He was in the house when Stephanie was attacked by Druze, and the police have established that it was Loverboy, who cleaned all evidence of his presence from the house before calling 911 from a nearby phone booth. At the very end of the novel, we learn that Lucas figured out Loverboy's identity from a list of clues he has inadvertently left behind. Loverboy is Lucas's commander, Quentin Daniel.
Eyes of Prey