A tale of high adventure and derring-do set in the same Victorian-style world as the acclaimed The Court of the Air and The Rise of the Iron Moon. A secret grave enough to kill for! The isolated island of Jago is the only home Hannah Conquest has ever known. But her carefree existence comes to an abrupt halt when her guardian, Archbishop Alice Grey, is brutally murdered. Someone desperately wants to suppress a secret kept by the archbishop, and if the attempts on Hannah's own life are any indication, the killer believes that Alice passed the knowledge of it onto her ward before her head was separated from her neck. Meanwhile, a deadly power struggle is brewing on Jago. And as Hannah digs deeper into the mystery Alice left behind, assisted by two rather different detectives, she must race to unravel a chain of ancient riddles in order to save not just her own life, but her island home itself!