Stevenson, Robert Louis

While going through the possessions of a deceased guest who owed them money, the mistress of the inn and her son find a treasure map that leads them to a pirate's fortune.

When a boy and his mother search the belongings of a deceased sailor who owed them money they find a treasure map. An interested family friend outfits a ship to sail to the location on the map but discovers too late that half his crew is comprised of pirates.