Still grieving over the brutal murder of her twin sister, high schooler Tanya Beach (Tiffany Edwardsen) joins her friends for a graduation celebration at a remote vacation cottage, where she's struck with a torrent of haunting visions. As the night wears on, her fellow partygoers are mysteriously picked off one by one, leaving Tanya alone to uncover the killer's identity … and why she's been spared.