The chill of a San Francisco summer can be deadly. No one knows this better than Capri Sanzio, who makes her living giving serial killer tours of the city. Capri has been interested in the topic since she was a kid, when she discovered she’s the granddaughter of serial killer William "Overkill Bill" Sanzio. She’s always believed in his innocence. But now an Overkill Bill copycat has struck in San Francisco. And Capri’s former mother-in-law, Sylvia, just cut off Capri’s daughter’s tuition payments. Needing cash, Capri wonders if this is the time to exonerate her grandfather.

Saffy Huntley-Oliver is an intelligent and glamorous socialite; she also happens to be a proficient serial killer. For the past fifteen years, she’s hunted down and dispatched rapists, murderers, domestic abusers—bad men all. But leading a double life has left her lonely—dating’s tough when your boyfriend might turn out to be your next victim. Saffy thinks she’s finally found a truly good man in Jonathan Desrosiers, a true-crime podcaster who’s amassed legions of diehard fans for cracking cold cases and bringing justice to victims.

Remi Finch has spent the better part of her adult life avoiding family—especially her sisters. They just don’t click. Besides, her unconventional upbringing and major anxiety have convinced Remi that she can’t build a relationship with anyone. Period. When her parents plan a family reunion camping trip to celebrate their anniversary, Remi’s willing to reconnect, if only because she doesn’t have a choice. But then a dead body turns up at their campsite, and their sisterly bonding kicks into high gear.

What if the most dangerous serial killer is the one who hunts her own kind? By day, Leah Nachtnebel is celebrated as one of the greatest pianists of our time. By night, she becomes a ruthless killer, using her brilliant mind to hunt predators who believe they’ve escaped justice. But when her latest target unearths a connection to her dark past, Leah is thrust into the crosshairs of two relentless forces: an FBI agent determined to uncover her secrets and a sadistic serial killer who doesn’t just see her as a traitor—he sees her as a trophy he must possess.

The night after her father's funeral, Claire meets Lucas in a bar. Lucas doesn't know it, but it's not a chance meeting. One thoughtless mistyped email has put him in the crosshairs of an extremely put-out serial killer. But before they make eye contact, before Claire lets him buy her a drink—even before she takes him home and carves him up into little pieces—something about that night is very wrong. Because someone is watching Claire. Someone who is about to discover her murderous little hobby.