A teenage girl with an ageless power.

A rebellion that begs her to use it for vengeance.

A follower in the sky that she cannot outrun.

And a choice that will change her life.

Set in Petros, an Ancient Greece-like land of mesmerizing myths and monsters, Moonbow follows Iris, a despairing young woman who has spent three agonizing years as a slave to Acheron, the sadistic officer responsible for burning her brother alive. But when Iris's own life is threatened at the bronze tip of an outlaw's blade, she receives an astonishing, long-awaited power, and with it, the confidence and weapon she needs to fulfill her greatest desire: avenge her brother, or die trying. If only the Moonbow, that unavoidable symbol of redemption shining in the sky, would let her be....

Armed with a warrior's dagger and an explosive new power, Iris finds herself at the headquarters of the zealots who call themselves the Soukinoi after the sacred amber scrolls they house inside their temple. Their leader is Diokles, a charismatic, godlike man who captivates Iris with his passion and vision to liberate all of Petros from its oppressors, and most importantly, train her skill and lead her to Acheron.

Overcome by her obsession, Iris now calls herself Hunter, and will stop at nothing, not even the killing of innocents, to reach her goal. But on the day she reunites with Tycho, a mysterious former Soukinoi who has been taken prisoner by Diokles and sentenced to death, Iris can't fight the urge to speak up for his life. Now, both she and Tycho are on Diokles's blacklist, and only a single misstep stands between them and a fatal encounter with the Gryphon, the gigantic, flesh-eating bird Iris thought existed only in myth.

After Tycho's escape, Iris knows her time is short. While being escorted back to Diokles, she receives alarming information about her brother's death and finds out that Diokles's plans are far more sinister than they seem. Wrestling with strong feelings of guilt and disillusionment, and unable to dispute the supernatural happenings around and within her, Iris must decide whether the Moonbow truly does hold the answers she's searching for....