"A whole man, made of all men, worth all of them, and any one of them worth him." This was how Jean-Paul Sartre characterized himself at the end of his autobiographical study, Words. And Bernard-Henri Levy shows how Sartre cannot be understood without taking into account his relations with the intellectual forebears and contemporaries, the lovers and friends, with whom he conducted a lifelong debate. His thinking was essentially a tumultuous dialogue...