Bob Shaw 
Peace Machine [EPUB ebook] 

Lucas Hutchman is the Ground Zero Man The man who has his finger on the button, the man who can destroy the world — or save it, the man whose own life suddenly has no value, unless he can make the governments of Earth understand that he is the absolute master of the ultimate doomsday device — a device that can trigger every nuclear weapon in existence if Hutchman’s demands are not met in time.