Accused of a wrong he did not commit, young Bellerophon is given a mission with no way back: to face the Chimera, the monster that breathes fire. His only hope is a winged horse no one has ever managed to ride — and a gift left behind by the goddess Athena.

With Athena's mirrored shield and Hermes's sword, Perseus sets out to find Medusa, whose gaze turns everything to stone. Along the way: three old sisters who share a single eye, a princess chained to a cliff, and the fulfillment of an ancient prophecy.