There’s a murderer stalking the gay bars of Berlin.

It’s September, the time of Folsom Europe, the city’s annual festival for gay men in leather. And Berlin’s become a dangerous place for them. British lawyer and part-time sleuth Dominic Delingpole is in town. He’s come to Berlin to visit Matty, the teenage son he first met only a year ago. When Matty is arrested for the attacks, Dominic teams up with German lawyer Johann Hartmann, a good-looking man with a seductive charm. As they battle to prove Matty’s innocence, Dominic and Johann discover the attacks are linked to a sinister, Russian-backed experiment. But whose side is Hartmann really on?