In the Autumn of 1891, Oscar Wilde set about conquering literary Paris. Gide was dazzled by the Irishman's energy and verve, but was driven to the edge of a nervous breakdown by Wilde's merciless paradoxes and questioning of religious faith. The two writers met repeatedly over the next ten years in France, Italy, and North Africa, both before and after Wilde's imprisonment. But by the time Wilde died in Paris in 1900, the tables had been turned. He...