THE KING’S DAUGHTER is a fantastic adventure fantasy. The French king, Louis XIV, is obsessed with his mortality and the country’s future. He asks the royal physician to help him obtain the key to immortality. The royal physician believes mermaids contain a force that grants everlasting life. Louis is doubtful, but he commissions a young sea captain to search the seas for a mermaid. The captain brings back a female to the King’s court. Meanwhile, King Louis orders his orphaned daughter, Marie-Josèphe, brought to Versailles. Marie establishes a connection with the mermaid and falls for the sea captain. Together, they try to save the mermaid’s life.