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 explores the life of a Spanish expatriate in England who is recruited by a secretive organization due to his unique ability to interpret people's behavior. As he becomes entangled in a world of espionage, he grapples with moral and ethical dilemmas, questioning the validity of his work and the consequences of his actions. Through a blend of introspective musings and suspenseful narrative, the protagonist's life unravels, revealing a complex web of deceit, betrayal, and violence.

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.

"The Guardians" explores the formation and impact of the League of Nations' mandates system following World War I. The book delves into how the League aimed to administer former colonies and territories of the defeated powers through a new global governance model. It examines the roles played by various international administrators and the challenges they faced in balancing the interests of the former colonial powers with the aspirations of the local populations. The narrative also highlights the broader implications of the mandates system on international relations and its legacy in shaping modern concepts of international oversight and governance.