Seeking to pursue his dream in music, and harboring a grave secret, young Gerard Rougeaux leaves his native Montreal for New York City in 1909, embarking on a journey that then takes him to Paris at the height of the Jazz Age. There, years later, Gerard becomes haunted by strange dreams of a boy falling through space, as his story entwines with the family he has left behind—his half-sister Jeannette and her two children, struggling to make their way in New York after the economic crash of 1929.

Continuing the family epic begun in House of Rougeaux, Boy, Falling weaves together human yearning and mystery, and what it means to be part of the fabric of life.