In the year 42 BC, Caesar arrives at the Rubicon River along with the legion that follows him. Pompey awaits him in Rome, convinced of his superiority. The Rubicon is the limit of his province and, as consul, Caesar knows that if he and his legion cross it, it would violate the law of Rome and would begin a civil war. This book collects the conversation between the two men, which is also a conversation between the two authors of this work. It reveals the absolute character of César. The result is an epistolary novel as lucid as it is memorable.