In "The Bourne Identity" by Robert Ludlum, the story unfolds around a man suffering from amnesia who struggles to piece together his identity. As he navigates a world filled with danger and mystery, he discovers that he has exceptional skills and is possibly involved in espionage. The narrative delves into themes of self-discovery, trust, and the quest for truth amid betrayal.

One underlying message in the book suggests that while individuals may share experiences or connections, each person maintains their own identity and perspective. This concept is encapsulated in the idea that "two people were not one," emphasizing the complexity of human relationships and the distinctiveness inherent in each individual.