Aria Tang West thought she'd be spending one last summer on Martha's Vineyard with her friends before starting MIT in the fall, where she intends to study astronomy, like her late grandfather. But after topless photos of her are posted online, she's abruptly uninvited from her friends' summer homes.

Aria's parents, a writer and opera singer with plans of their own, send Aria to stay with her artist grandmother, Joan West, in Northern California. Although Aria has never been attracted to girls before, she finds herself drawn to Joan's gardener, Steph Nichols, an aspiring musician a few years older than Aria. The only problem? Steph isn't single; she lives with her girlfriend, Lisa. But the chemistry between Aria and Steph seems undeniable, and this will be a summer that will turn her world upside down.