Fiona claims she doesn't remember anything about the night her best friend Trixie left a party and walked into the ocean. It's ruled a suicide, but Fiona doesn't believe her Trixie is really dead—and she is determined to find out why Trixie would want everyone to think she is.

Fiona enlists the help of Trixie's former best-friend-with-benefits, and their search for the truth leads them toward another suicide case in their small, ocean-side town. But the closer Fiona gets to finding out what happened, the more she realizes that she might not have known her best friend at all.