Eustace finds a treasure map his dead brother, Horace, left him. It leads to a golden hat in a cave. Eustace, Muriel and Courage go there. When Eustace takes the golden hat, monks that live there capture the three. Then they try to sacrifice Muriel to their God, which is a rock statue. Courage destroys the rock by giving it a strange coat. Eustace finally gets the hat, but when he puts it on he turns to stone.
