The Sword of Cortes (The Pirates of the Caribbean: Jack Sparrow #4) by Rob Kidd

BEFORE THE BLACK PEARL, THERE WAS A TEENAGE STOWAWAY NAMED JACK SPARROW ...

He has the enchanted sheath. He's read the mystical incantation. He's holding the all-powerful Sword of Cortes in his hands. But unfortunately for Jack Sparrow, he also has the spectre of the Sword's first master--Hernan Cortes--watching over his shoulder. Now, stranded on a snowy Caribbean island, the fate of the Barnacle's crew hangs in the balance. Jack must find a way to command the unwieldly power of the Sword, defeat Cortes, and save his mates.

But, as usual, it won't be very easy.