Can a monster choose to be good? That's the question facing Kyra Anastas. With snakes for hair and a gaze that turns men to stone, Kyra is a modern-day Medusa, making a living in Chicago as a hitwoman for hire. Feared and hated even by her fellow Mythic, she lives a solitary and bitter existence until a dying millionaire asks Kyra to protect her daughter from supernatural dangers. Eager to be more than just a dealer of death, Kyra takes the job. But the road to redemption will force Kyra to face all her demons - not just the monsters chasing them across the Windy City, but also the horrors that haunt her own evil past.