As monsters walk the streets of San Francisco, unseen by humans, three teenaged descendants of Medusa, the once-beautiful gorgon maligned in Greek mythology, must reunite and embrace their fates.

Kenna Swift has a lot on her plate--a mother who's missing, a best friend who's betrayed her, a boyfriend on trial for treason, and a new superpower she's still figuring out how to control. Not to mention she's recently learned the darkest, most dangerous secrets of the superhero world. With her team fractured and time running out, she hatches a daring plot to save those she loves the most. But soon Kenna and her friends find themselves caught in...

When her mother suddenly decides to marry a near-stranger, Phoebe, whose passion is running, soon finds herself living on a remote Greek island, completing her senior year at an ancient high school where the students and teachers are all descended from gods or goddesses.