When Maggie and Emily first meet as young girls on a Nantucket beach they immediately become friends, spending many happy summers together. Now in their twenties, Emily has almost finished her studies, while Maggie is pursuing her dream of being a writer.

When the charismatic Cameron Chadwick bursts onto the scene, their lives are upended in ways they never could have imagined. As Maggie and Emily fall under the spell of the charming newcomer, their friendship soon feels a long way from the idyllic, care-free days of their childhood.

Life-altering decisions must be made. And at the heart of it all, both women must struggle to face the choices they make, the secrets they keep, and the futures they dream of. Can their friendship survive the tests that lie ahead?