Beautiful. Fearless. Dangerous. They're the kind of girls you envy; the kind of girls you want to hate. Strangers in town for the summer, Penn, Thea, and Lexi have caught everyone's attention, including the eye of practical Harper. But it's her sister, Gemma, they've chosen to be part of their group. Sixteen-year-old Gemma seems to have it all - carefree, pretty, and falling in love with the boy next door. But her greatest passion has always been the water. She craves late night swims under the ...