"Humans vs. Kzin: Testament of Ages" is the seventh book in the series "The Man-Kzin Wars", the author of which is Larry Niven. This work reveals to the reader a turning point in the war between humans and the Kzin, based on the universe of "Interstellar Barbarians". A diverse and unpredictable plot takes place, full of philosophical reflections and battle scenes, which will throw the reader into a whirlwind of distant space adventures. In this book, the author depicts the complex relations between races and presents his own thoughts about the confrontation and coexistence of different civilizations. Niven's work impresses with its attention to detail and the richness of the fictional universe, which will not leave indifferent any fan of science fiction literature.