Ribbon Falls - Brad Anderson - Bog

It was the perfect day to test the recently overhauled engines: an almost cloudless sky and just a light chop in the Gulf of Mexico. However, before the run at full throttle could even start, Jeff Warne, Chuck Hill, and David Michaelson found a not-so-abandoned cigar boat. They came away rich and terrified, because as long as the owner Pablo Padilla remained alive, their lives were in danger. So, they hired someone to hide the treasure and waited for Padilla to die.

Around the time Padilla''s obituary appears in the newspapers twenty-six years later, Patrick Kingrea stumbles upon a torn piece of map with "Cave, Ledge above entrance, 3 shares in packs" written on the back. A circled "Ribbon Falls" on the map is the only clue he has of where something valuable might be hidden.
After Jeff and Chuck lose interest in pursuing the loot, David decides to challenge Patrick for full ownership - after Patrick retrieves the "3 shares in packs".