Raised as a mortal after her mother’s mysterious death, artistic 15-year-old Eden has no idea that she is the Muse Warrior, the last and most powerful heir of the Roman Sun God Apollo and the muse Calliope, until she relocates to Italy with her father and brother Troy. Haunted by recurring nightmares of a firefly and romantic visions of Apollo and Calliope, Eden seeks solace in her art journal, volleyball and new friendship with Bax, the cute guy whose dad heads base security.
But Troy’s sudden disappearance on a school trip leads Eden on a scavenger hunt that uncovers a thousand-year-old family secret: not only is she a Muse (a powerful, mythological source of inspiration for mortals), but she must settle an ancient debt for the gods on Mount Olympus and defeat the evil sorceress Sibyl... or die trying.
With help from fleet-footed Mercury, amateur geocacher Bax, and a handful of Roman Gods, Eden races against time to save her brother. Staying alive is one thing, but can she also stop an all-out war between the Olympians and the King of the Dead?