Isabelle, a young French maid, follows her notorious mistress to the island of St. Helena after Napoleon's defeat at Waterloo. She discovers quickly that a "beast" roams this remote island, and people are vanishing or found drained of blood. She falls in love with Saint-Denis, Napoleon's valet, but this enigmatic young man hides a deadly secret. Hudson Lowe, the island's governor—a vampire himself—plans to destroy the French. Isabelle rushes with her lover to stop the vicious outcome, and save her own life.