Something venomous has come to Temperance … It's been two months since Petra Dee and her coyote sidekick Sig faced off against Temperance's resident alchemist, but things are far from quiet. When an Internet video of a massive snake in the backcountry of Yellowstone goes viral, a chase for the mythical basilisk is on. Monster hunters swarm into the area, and never one to pass up the promise of discovery, Petra joins in the search. Among the newcomers is a snake cult on wheels―the biker gang Sisters of Serpens. Unlike some, the Sisters don't want to kill the basilisk―they want to worship it. But things get complicated when the basilisk develops a taste for human flesh that rivals the Sisters' own murderous skills. Meanwhile, the alchemical tree of life is dying, and the undead Hanged Men of Temperance who depend on it know the basilisk may be their last chance for survival. With time running out for everyone around her, Petra will be forced to decide who survives and who she must leave behind in this action-packed sequel to Dark Alchemy.