Eighteen-year-old Anne has always been jealous of her attractive and successful older sister, Haley. Feeling second best is something she has grown used to. But when a handsome young man rejects her advances and takes a shine to Haley instead, it is one humiliation too many. Seething with envy, Anne decides to take revenge the only way she knows how - by using her young body and sexual charms to destroy Haley's relationship. Before long behaving wickedly becomes an obsession and Anne relishes the rewards her promiscuous behaviour brings her. Prepared to go to any extreme to trump her sister, Anne makes plans to seduce Haley's future husband on the night before the wedding.