Born to a Danish seamstress and a black West Indian cook in one of the Western Hemisphere's most infamous vice districts, Nella Larsen (1891-1964) lived her life in the shadows of America's racial divide. She wrote about that life, was briefly celebrated in her time, then was lost to later generations--only to be rediscovered and hailed by many as the best black novelist of her generation. In his search for Nella Larsen, the "mystery woman of the...