In the supernatural maelstrom of Mystic Falls, Cassandra Thorn, a young woman plagued by unpredictable premonitions, finds her life irrevocably entwined with ancient vampires. When a masquerade ball turns deadly and Elena Gilbert is targeted, Cassie is dragged into a dangerous game. She soon discovers that the mysterious Original vampire, Elijah Mikaelson, has a chilling interest in her unique abilities. Can Cassie navigate a world of hidden truths, powerful beings, and her own unsettling visions, or will her 'hamartia' lead to her undoing?