The number-one New York Times best-selling author Kelley Armstrong delivers the novel her fans have been clamoring for: The epic finale of the Otherworld series.

It's been more than 10 years, a dozen installments, and hundreds of thousands of copies since Kelley Armstrong introduced readers to the all-too-real denizens of the Otherworld: witches, werewolves, necromancers, vampires, and half-demons, among others. And it's all been leading to Thirteen, the final installment, the novel that brings all of these stories to a stunning conclusion.

A war is brewing - the first battle has been waged and Savannah Levine is left standing, albeit battered and bruised. She has rescued her half-brother from supernatural medical testing, but he's fighting to stay alive. The Supernatural Liberation Movement took him hostage, and they have a maniacal plan to expose the supernatural world to the unknowing.

Savannah has called upon her inner energy to summon spells with frightening strength - a strength she never knew she had - as she fights to keep her world from shattering. But it's more than a matter of supernaturals against one another - both heaven and hell have entered the war; hellhounds, genetically modified werewolves, and all forces of good and evil have joined the fray.

Uniting Savannah with Adam, Paige, Lucas, Jaime, Hope, and other lost-but-not-forgotten characters in one epic battle, Thirteen is a grand, crowd-pleasing closer for Armstrong's legions of fans.