"Belle du Seigneur" is a tragic love story set in the 1930s, revolving around a high-ranking Jewish official who works for the League of Nations and his passionate affair with a married Swiss aristocrat. The narrative delves deep into their intense relationship, exploring themes of obsession, self-destruction, and existential despair, all set against the backdrop of the impending Second World War. The novel is also notable for its satirical portrayal of diplomatic life and its exploration of Jewish identity.

The novel is a historical fiction that follows the life of Désirée Clary, a young silk merchant's daughter from Marseille, who becomes romantically involved with a young Napoleon Bonaparte before he rises to power. After their relationship ends, Désirée finds herself navigating the complexities of French society during a turbulent period, eventually marrying Jean-Baptiste Bernadotte, who later becomes King Charles XIV John of Sweden. The story, told through a series of fictionalized letters and diary entries, portrays Désirée's transformation from a naive girl into a mature woman and a queen, offering a unique perspective on the political and social upheavals of the Napoleonic era.

The book revolves around a Swiss classics teacher who, upon encountering a mysterious book by a Portuguese author, becomes obsessed with the life and thoughts of the writer. This obsession leads him to abandon his job and life in Bern, embarking on an impulsive journey to Lisbon. In his quest to understand the author's fate and the resistance movement against the Portuguese dictatorship that the author was involved in, the protagonist explores themes of history, philosophy, and the complexities of human character. As he delves deeper into the past, he encounters various individuals who were connected to the author, piecing together a narrative that challenges his own understanding of life and identity.

The novel explores the intricate lives and psychological depths of a vast array of characters in interwar Vienna, focusing on the transformative experiences and moral dilemmas they face. Through a richly woven narrative, the book delves into themes of power, guilt, and redemption, set against the backdrop of a society on the brink of monumental change. The story masterfully intertwines the personal and political, revealing the complex interplay between individual desires and societal pressures. Through its detailed portrayal of Vienna and its inhabitants, the novel offers a profound commentary on the human condition, examining how the demons within and without shape our destinies.