Horace F. Andrews, armed with a strange wooden box, and Chloe Burke, wearing a mysterious dragonfly pendant, become entangled in a secret and ancient society striving to protect powerful devices from the evil Riven.

This electrifying conclusion to the #1 New York times best-selling series follows Emily as she travels to Typhon to confront the fraud who has seized power in the absence of a king and must rely on new friends and old enemies to survive the threat of darkness.

"Just when you thought it was safe to go back into the teahouse. . . . Miss Charlotte Pettifer belongs to a secret league of women skilled in the subtle arts. That is to say-although it must never be said-witchcraft. The Wicken League strives to improve the world in small ways. Using magic, they tidy, correct, and manipulate according to their notions of what is proper, entirely unlike those reprobates in the Wisteria Society. When the long-lost amulet...

Emily and her brother Navin head for Kanalis to find an antidote for the poison that is killing their mother.

When Persians invade Sparta while thirteen-year-old Lysander is training to be a soldier, he finds his loyalties are divided between Spartan honor and the Helot slaves with whom he lived most of his life.

Visiting an island that lets them access lost memories, Emily, Trellis, and Vigo try to uncover the events of Trellis's mysterious childhood, knowledge they can use against the Elf King, but they discover a dark secret that changes everything.

Emily survived the chaos of the Guardian Academy, but Max Griffin has stolen the Mother Stone. With it, the Elf King forges new amulets that will give him the power to invade and destroy the nation of Windsor. Emily and her friends lead the soldiers of the Cielis Guard in a fight to stop him, but Max stands in their way. And when she seeks information from the Voice of her Amulet, she discovers that the Voice is much more sinister than she ever could...