Reborn as the Flame, thirteen-year-old Emily has saved Olympus from destruction, but when the gruesome Nirads begin a new invasion, Emily and her friends become entangled in the conflict as old grudges are unearthed and new enemies are discovered.

A deadly plague has struck Olympus. While the Olympians fade one by one, Emilys heart breaks as she watches, particularly when Pegasus begins to slip away. Determined to save him, she embarks on an investigation that takes her back in time to the origins of Olympus and to the deadly battle between the Olympians and the Titans. In the present, she must face the force of the CRU. In the past, she must confront Cronus, the father of the gods and leader...

Emily is contending with great changes, including diminished powers, but goes to London to rescue Agent B and others from the CRU, where she makes horrible discoveries about the agency's history.