This one contains, among various personal items, the magical sheath for the Sword of Cortés.
See more » A scene after the end credits shows Will and Elizabeth asleep when their bedroom is entered by a silhouette of Davy Jones.
Jack seems unaffected by the Song, and wonders what is afoot.
He is then taken deep below the ocean, after strange creatures start attacking the Barnacle and confronted with antagonist mermaids in an undersea mermaid kingdom.
They all battle on the beach, for who would get the Sword of Cortés's sheath, and Jack eventually defeats Torrents and escapes on the Barnacle.
It is revealed in this book that Jack knew Benjamin Franklin, and taught him the secrets of electricity.
It is followed by the series Pirates of the Caribbean: Legends of the Brethren Court, set thirteen years before Pirates of the Caribbean: The Curse of the Black Pearl.