When Private Investigator Jackson Douglas is approached by "history hunter" Joel Robinson with a legend about Crusader treasure, he is more than a little wary. But Joel seems legitimate and believes in Jackson's investigative skills. And he's paying very well. So Jackson joins Joel and his team in their pursuit to decipher the riddle of "The Holy Trinity," believed to be the key to locating the treasure. Questions loom over the expedition from the beginning. What exactly is the treasure? What power did the Crusaders believe it possessed? Why did they go to such great lengths to conceal it? Who else is after the treasure, and what danger do they pose to the team? And which of his teammates can Jackson trust . . . and which can't he? The quest will take Jackson from a prestigious art gallery in New York City to a secret vault high in the Alps to the very land the Crusaders and Muslims fought over centuries ago, testing his deductive abilities-and his faith-at every turn.