Archangel — Robert Harris

It would be the find of a lifetime--a personal notebook that once belonged to Josef Stalin. For Fluke Kelso, a British professor of Russian history, unearthing it would catapult him from the ranks of mediocrity to fame and fortune. But more than one life is at stake in the murderous race for the truth. And in the vast forests of northern Russia, the final, shocking secret of Josef Stalin, hidden for almost half a century, waits to be discovered...