When a team of archaeologists unearth a palace belonging to a mythical king, they don't just rewrite history - they paint a target on their backs.

CIA operative Ridley Samaras is sent to Greece to protect the leaders of the dig-a father and daughter who are outspoken Iranian dissidents-from the assassins dispatched by the regime. But Ridley has a second directive: follow the ancient writings they discovered, which map the lost locations of the supernatural weapons used to slay Medusa.

Forced to partner with a State Department agent she doesn't like, and hunted by professional killers on every shore, Ridley leads the team from the islands of Greece to the pyramids of Egypt, from the coast of Morocco to the slopes of Mount Etna, where the line between myth and reality turns out to be thinner-and deadlier-than anyone dared to believe.