Harry Harrison 
Planet of the Damned [EPUB ebook] 
With linked Table of Contents

Brion Brandd was chosen for the mission because he was the very best of the best. It is up to him to avert a nuclear war, but even all his training and intelligence might not be enough to save a world. Nothing is as it seems and every action could be his last. This tightly plotted adventure novel was nominated for the prestigious Hugo Award.