She's been on a no-dating streak for a while, along with her "sisters", the Muses. Each have within them a Muse from Greek mythology. Callie's is the Muse of Epic Poetry. A group of men are out to get her and her sisters, and they each must connect with their Guardian in order to survive. Hunter Armstrong, a Navy SEAL home after a mission overseas, is that Guardian for her. Soon Callie's no-dating rule is gone, and she and Hunter must work together to keep her alive.