Three for the Money - Darrell Bain - Bog

This wild chase tops the dinosaur and Bigfoot (or an alien, most likely) for craziness and extremely dangerous clues to the Godfather's billions--and to a treasure supposedly worth far more than that. The Williard brothers are showing their age but not ready to slow down yet, even if it kills them--and it very well might because they are headed into their most dangerous, wildest adventure.