A Spy's Life — Henry Porter

Now a seemingly mild-mannered water inspector for the United Nations, Robert Harland, once a dangerous spy, soon finds that his past has caught up with him when he survives a plane crash, everyone around him begins vanishing, and a young man arrives claiming to be his son, plunging Robert into a tangled web of murder and intrigue that forces him to confront his past. 25,000 first printing.