A nightclub crooner and his sidekick find themselves on the run from gangsters and flee to Cuba, accompanied by a stunning heiress who has come into possession of a haunted castle on a remote island. As they search for a concealed treasure, the trio faces a series of supernatural challenges, including a ghost, a zombie, and a shadowy killer lurking in the shadows. With a mix of comedy, music, and thrilling escapades, they must navigate the eerie and dangerous landscape to uncover the secrets of the castle and survive their harrowing adventure.