Ex-cop Mas Hammett, now a private investigator, encounters Sophie Chandler. Her sister has been murdered, and it looks like a serial killer has come to San Francisco. The only link between the victims is the kink community. Mas uses his contacts to investigate, but diving into the community raises long-buried feelings, especially when he realizes Sophie is a Domme. As they delve into Silicon Valley, they discover corruption in high places as well as their own passionate D/s romance that could help or hinder their investigation. Will they untangle the web of deceit and danger, or will they become engulfed in the darkness?