Set against the backdrop of the Prague Spring period of Czechoslovak history, the novel explores the philosophical concept of Nietzsche's eternal return through the intertwined lives of four characters: a womanizing surgeon, his intellectual wife, his naïve mistress, and her stoic lover. The narrative delves into their personal struggles with lightness and heaviness, freedom and fate, love and betrayal, and the complexities of human relationships, all while offering a profound meditation on the nature of existence and the paradoxes of life.

This novel is a blend of fiction, autobiography, and philosophical musings that explores the nature of forgetting, the power of laughter, and the struggle for personal and political freedom. Set against the backdrop of the political turmoil in Czechoslovakia in the 20th century, it follows the interconnected stories of various characters, including a man who is expelled from the Communist Party, a young woman in love with a man whose father was a political prisoner, and a couple who flee to America. Throughout, the book delves into the ways in which personal and collective memories shape identity and history.

This narrative revolves around a proofreader named Raimundo Silva, who, while working on a historical text about the Siege of Lisbon, decides to alter history by adding a single word to the text, turning the factual account into a fictional one. This act of rebellion leads him into a relationship with his boss, Maria Sara, and together they explore the consequences of questioning historical facts and narratives. The story also delves into the power of language and storytelling, and the blurred lines between history and fiction.

In this surreal exploration, the Iberian Peninsula breaks off from the rest of Europe and begins to drift across the Atlantic Ocean. As the governments and international community scramble to understand and respond to the phenomenon, five disparate individuals find themselves drawn together on a journey across the newly isolated landscape. Through their experiences and interactions, the narrative explores themes of identity, nationality, and the arbitrary nature of borders.