"Ambassador" is a science fiction novel by the famous writer of Ukrainian origin, Serhiy Lukyanenko. In this book, he will introduce readers to the unique world of international relations, diplomacy and the future. The main character, who is also named "Ambassador", gets into another reality, where he has to perform a dangerous task - to save the world from the threat of an external enemy. The author explores complex issues related to changing identities, mutual understanding between civilizations, and the cost of peace in the modern world. "Ambassador" is a book that captivates with its atmosphere, Arthurian battle scenes, strange technologies and philosophical reflections. This novel will leave readers on the edge of wonder and menace, prompting them to think about the future of humanity and its place in the vastness of the universe.