Predator

Predator is a dark crime thriller. Brutal murders are linked by a common thread: all the victims are customers of an adult sexual products company called Pleasure World. The disturbed killer, homosexual Vester Grewg, detectives Gary Blake and Julie Nicks, and a cast of victims and others intersect in the wake of the crimes. Vester Grewg, a former employee of Pleasure World, is fired for erratic behavior.
He is consumed by a hatred for those he deems "sexual perverts, " Grewg begins targeting customers whose personal information he stole from his old job. Detective Gary Blake is a seasoned officer struggling with the emotional toll of his work and a strained marriage. His partner, Julie Nicks, is ambitious, intelligent, and wrestling with her own personal  feelings for Blake. Together, they investigate the murders, gradually uncovering the connection between the victims and Pleasure World.
As the body count rises, the city is gripped by fear, and the police come under intense public and media scrutiny. The investigation is complicated by internal department politics, personal rivalries, and the killer's ability to blend into the population. The novel is gritty, explicit, and unflinching in its depiction of violence, male and male fantasy, sexuality, and the psychological scars left by both.