Hunt at the well of eternity - James Reasoner

From the towers of Manhattan to the jungles of South America, from the sands of the Sahara to the frozen crags of Antarctica, one man finds adventure everywhere he goes: GABRIEL HUNT. Backed by the resources of the $100 million Hunt Foundation and armed with his trusty Colt revolver, Gabriel Hunt has always been ready for anything--but is he prepared for the adventures that lie in wait for him?

The woman carrying the bloodstained flag seemed desperate for help--but it was the attack that followed that convinced Gabriel there was something here men would kill for. And that was before he knew about the dungeon in the Mayan ruins, or the legendary secret hidden in the rain forest of Guatemala...