After telling the story of Flint’s last journey to young Jim Hawkins, Billy Bones has a heart attack and dies just as Jim and his friends are attacked by pirates. The gang escapes into the town where they hire out a boat and crew to find the hidden treasure, which was revealed by Bones before he died. On their voyage across the seas, they soon find out that not everyone on board can be trusted.

Morgan Adams and her slave, William Shaw, are on a quest to recover the three portions of a treasure map. Unfortunately, the final portion is held by her murderous uncle, Dawg. Her crew is skeptical 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 pirate raids.