Novelist and essayist Hilary Masters recreates a moment in 1940s Pittsburgh when circumstances, ideology, and a passion for the arts collided to produce a masterpiece in another part of the world.

E. J. Kaufmann, the so-called "merchant prince" who commissioned Frank Lloyd Wright's Fallingwater, was a man whose hunger for beauty included women as well as architecture.

He had transformed his family's department store into an art deco showcase with murals by Boardman Robinson and now sought to beautify the walls of the YM&WHA of which he was the president. Through his son E. J. Kaufmann,...