Kiss Me Dead - The Jen Madden Mysteries, #1

What does the detective do when she discovers her own body is somehow being used as the murder weapon? This ingenious mystery will baffle you to the end and includes one of the steamiest lesbian/SM relationships you'll ever read.
When unashamedly bisexual ad-woman Jen Madden joins an orgy on a yacht, she finds that those who sleep with her, or with her friend Maxine, drop dead.
Then Maxine is killed and Jen becomes a murder suspect. But, inexplicably, the police put the case on ice. Progressively, everyone who attended the orgy is killed except for Jen, who's certain she's next on a hit list and terrified for her life.
When her agency retrenches her, she falls for a dominant lesbian who orders her to sleep with specific men. Each dies after she does so - confirming she's being used as a bedroom assassin - although medical tests prove there's no way this can happen.
So Jen is forced to become the detective, helped by a male reporter to whom she's becoming attracted. But unearthing the murder method tests her intelligence and courage to the limit. Eventually everyone betrays her, including the reporter. It's one woman against the world. And she has only her nous and sexual flair to get her through.