 Morgan Adams (Geena Davis) and her slave, William Shaw (Matthew Modine), are on a quest to recover the three portions of a treasure map. Unfortunately, the final portion is held by her murderous uncle, Dawg (Frank Langella). Her crew is sceptical of her leadership abilities, so she must complete her quest before they mutiny against her. This is made yet more difficult by the efforts of the British crown to end her piratical raids.