Exit Strategy by Lee Child and Andrew Child (Jack Reacher #30)

Jack Reacher will make three stops today. Not all of them were planned for.
First - a Baltimore coffee shop. A seat in the corner, facing the door. Black coffee, two refills, no messing about. A minor interruption from two of the customers, but nothing he can't deal with swiftly. As he leaves, a young guy brushes against him in the doorway. Instinctively Reacher checks the pocket holding his cash and passport. There's no problem. Nothing is missing.
Second - a store to buy a coat. Nothing fancy. Something he can ditch when he heads to warmer climes. Large enough to fit a man the size of a bank vault. As he pulls out his cash, he finds something new in his pocket. A handwritten note. A desperate plea for help.
Third - wherever this bend in the road takes him. Impressed by the guy's technique and intrigued by the message, Reacher makes it his mission to find out more . . .