Everything is in turmoil as Herne and Ember struggle to keep up with the collateral damage caused by the war against Typhon. But now, an old enemy reappears--stronger and more dangerous than before. Once again, the Hippocampi call for the Wild Hunt's help. Not only has Straff, the son of Blackthorn, returned to his old haunts, but several teens have gone missing from the Foam Born Encampment. Herne and Ember tread a delicate balance, searching both for the kidnapper, and the psychotic Ante-Fae. But when Ember makes a misstep, she falls into the hands of the King of Thorns. Will she be able to escape before he takes out his revenge on her?