A ring with a pink stone carries a curse of the lamia—a terrifying demon in a woman’s guise... According to legend, the descendants of Count Arrigo can’t marry anyone except the descendants of the witch Tufania, who poisoned more than six hundred people with a poison with the tender name “Aqua Tofana”... Vika Zaderiguba didn’t believe in stupid legends about mythical lamias and cunning poisoners. But when the members of Anton Firmanov’s family begin dying one after another from that mysterious poison—despite the fact that Anton somehow wanted to see Vika as the wife of one of his sons—and then Vika’s mother and stepfather are killed, the girl understands that the legend has quite real grounds. All traces lead to an unusual ring that, in Rome, the half-crazed old woman gave Vika... The jewelry is unique: with a pink stone, with a pattern of a grapevine in which something is hiding... a snake! Meanwhile, people around Vika continue to die...