Tin Cup Chalice: Jake Sullivan Series, Book 16 (Unabridged‪)‬

A defrocked priest comes to Jake Sullivan with a fantastic tale of ancient voyages, cryptic clues, and imminent dangers from present and medieval organizations in search of history's most sought after relic. Did a secret northern voyage, never recorded in history actually occur...and is it possible that it somehow connects to ruins on the Florida Coastal Waterway? 

As events unfold, Jake and Mike come to believe the tales may be true and the dangers real as they chase after enlightenment or disaster.