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.