New York: The Free Press, (1999). First edition - A major reassessment of one of the 20th century's leading writers and intellectuals. It "places the author of 'Darkness at Noon' in the front ranks of Cold Warriors. In addition, he deals with not only Koestler's later interest in science (and the paranormal), but also his contradictory and profoundly flawed character. . . Cesarani has had the benefit of Koestler's complete literary estate, his FBI files and the KGB's notorious 'Special Archive' to detail the writer's political and intellectual wanderings from his early involvement with Zionism in Palestine in the 1920s through his membership in the Communist Party in Nazi Berlin and Civil War Spain to his denunciation of Stalinism in England during WWII. . . In more disturbing revelations, besides Koestler's lifelong womanizing and three marriages (the last ended in dual suicide), Cesarani uncovers the details of one sexual assault and concludes that Koestler was a 'serial rapist.' In chronicling Koestler's remarkable political journey, public resolution and private wrongs, Cesarani's biography manages to be both authoritative and ambivalent." (Publishers Weekly) Includes list of works by Koestler, notes and sources, selective bibliography and index. x, 646 pp.