To celebrate the end of high school, Izzy Morales joins her best friend Kassidy and five friends on a luxury 1920s-themed getaway at the glamorous Ashwood Manor. There, Izzy and her friends party in vintage dresses and expensive diamonds - until Kassidy's boyfriend turns up dead.
And when a raging storm traps them on the island with two detectives, the sparkling young socialites become the prime suspects in his murder. There's the girlfriend, and the other girl. The old friend, and the new friend. The brooding enigma. And then, there's Izzy - the girl who brought the knife . . .