LAPD detective Michael Gideon and his K-9 partners try to outmaneuver not one but two serial killers, while investigating the suspicious death of a woman who belonged to a cult.

When a woman in Bel Air dies of a rattlesnake bite, the case doesn’t seem to fit the usual purview of LAPD’s Special Cases Unit. But Carrie Holder was no ordinary LA woman. She was a member of the city’s latest cult, the Church of the Gate, which counts Hollywood’s movers and shakers among its devotees.

Investigating the cult’s secrets takes Detective Michael Gideon, his German shepherd K-9 partner, Sirius, and pit bull rescue Emily across Los Angeles’s canyons, neighborhoods, and movie studio lots-but all the while, an even darker threat looms closer. The All-In Killer has left a trail of victims across the Southwest, but he’s no longer content to couch his threats in poker clues-the latest crime scene leaves no doubt that he’s coming for Gideon, and Sirius, too. With the FBI pressuring Gideon to visit Ellis Haines, aka the Weatherman, for insights on the case, can Gideon outwit not one but two serial killers?