Karel Čapek’s last major novel, War with the Newts, is a satirical dystopian masterpiece, both prescient and timeless, uniquely Czech and yet universal in appeal. Published in 1936, it remains one of the most thought-provoking novels ever written.
I've always dug it because it was one of the first explorations of a successful invasion from another species, and it was an excellent scifi deconstruction of colonialism, one that was groundbreaking for the time it was written (right before WWII).