Captive-in-Chief by Murray McDonald
Meet Joe Kelly, former Army Special operations forces, dishonorable discharge, current drunk and his service dog, Sandy. Joe is about to hear from his old friend, currently President of the United States of America, Clay, who desperately needs Joe's help ASAP. First problem, D.C. is several hundred miles away, Joe has no ID, and very little money to get there. You, the reader, are going to take a wild ride as Joe answers his president's call for help. This is not one you're going to be able to put down.