Solstice
(Book)

Offered an all-expenses-paid trip to the exclusive Solstice Festival, Adri throws caution, her prestigious summer internship, and her parents goodwill to the wind. Her life has been planned and scheduled in accordance to her parents' law school dreams, and Adri wants a summer of freedom. When the horde of affluent, entitled teen party-goers arrive at the island paradise, there's barely any food, nowhere to stay, and not nearly enough porta-potties. The music acts are canceling-- and the first dead body washes up on the beach. Who is killing off the helpless attendees? And even if Adri finds the killer, how can she hope to stop them? -- adapted from jacket