Seventeen-year-old Annie Tillery and her Aunt Jill set off for Long Island’s Fire Island for a vacation of surf, sun, and sailing. Annie is happy to leave behind the stress of her relationship with her parents. Aunt Jill, who is an NYPD detective, is mixing her vacation with a case she must keep secret from Annie, who is suspicious nevertheless. Annie finds romance and intrigue when she meets Ty Egan, the nephew of their host on the island. They find themselves in the middle of an eerie adventure when she and Ty investigate the tragic and perplexing story of a local ghost.