A pirate crewman kills his captain after learning where he has hidden his buried treasure. However, as he begins to lose his memory, he relies more and more on the ghost of the man he just murdered to help him find the loot.
Ghost in the Noonday Sun
In the 17th century, a pirate captain is murdered by his cook after he buries his treasure and marks it on a map but the poor-memory cook must rely on the captain's ghost to re-track the loot, since the map was drawn in disappearing ink.
