It is the Summer of 1918. War has been raging in Europe for nearly four years. The United States has joined the Allied cause and the pursuit pilots of America’s new Army Air Service find themselves pitted against a determined and battle-hardened enemy.

The flamboyant flying ace Vincent Durand, veteran of the French Foreign Legion and the Lafayette Escadrille, is tasked with leading a new squadron of young Americans into combat. One of them is Marcus Keating, an idealistic and capable pilot fresh from the flying club of Princeton University. They will both cross paths with the sassy Emily Daniels, an expatriate writer and activist living and working in the decadent Montparnasse district of Paris. Mortal danger, cruel deception, furious passion and tragic loss lie ahead...in the days When Heaven Was Falling.