The book is a poignant memoir reflecting on the transformative events and cultural atmosphere of Europe before World War I, through the interwar years and into the rise of the Nazis. It captures the author's experiences of growing up in a vibrant pre-war Vienna, the intellectual richness and artistic achievements of the time, as well as the profound sense of loss as the world he knew disintegrated into chaos and totalitarianism. With a mix of nostalgia and despair, the narrative serves as a lament for the lost world of European culture and as a warning about the fragility of peace and the human cost of war.

The novel revolves around a Canadian filmmaker living in London, grappling with a midlife crisis, a complex web of familial relationships, and the burden of his cultural identity. As he navigates through personal and professional challenges, he is haunted by the figure of the "Horseman," a symbol of moral judgment and a reminder of his own shortcomings. The protagonist's journey is interwoven with flashbacks to his childhood in Montreal, where the influence of his larger-than-life cousin and the vibrant Jewish community of St. Urbain Street shape his worldview. The narrative explores themes of guilt, the search for redemption, and the struggle to reconcile one's ambitions with the expectations of society and family.