The Old Man by Thomas Perry

For thirty-five years, Dan Chase has lived quietly in Vermont, raising a daughter and happily married until his wife died ten years ago. Chase has kept himself mentally and physically sharp waiting for the day when someone discovers who he really is and comes to kill him. That day is now. All those years ago, Chase delivered $20 million for the CIA to a man named Faris Hamzah, who was supposed to give the money to Libyan insurgents. Instead, Hamzah kept the money for himself. Chase stole it back, and when he tried to get in touch with his superiors, they cut him off completely. Chase had no choice, but to disappear. Now on the run, trying to outwit and overpower those who are coming after him, it's a cat and mouse game to see who comes out on top. The Old Man is a extremely satisfying fast-paced thriller perfect for a cold winter's day.