The Road to Gandolfo by Robert Ludlum

General MacKenzie Hawkins is a living military legend, a hero and a rogue. Sam Devereaux is a bright young ex-Harvard lawyer, now in the army, and he can't wait to get out. When the Hawk gets kicked out of the army for conduct unbecoming to an officer, his options are limited - but not for long. He has a plan, a plan so ambitious it will shock the world and make him a very rich man. He is going to get $400 million - a dollar from every Catholic in the world. And he's going to do it by kidnapping the Pope ...