The people of Kensho face new perils from a heavily armed armada from Earth and to save themselves and their planet, must abandon the Way and become wanderers in the void
From Wikipedia: Dennis Arthur Schmidt was an American science fiction and fantasy author publishing from 1978 to 1990. Common threads in his books are religion, discipline and mystical enemies.
If you enjoyed the previous chronicles of this saga, then this book is particularly satisfying in the fact that it wraps it all up so nicely.
I wouldn't recommend this as a standalone book, but for those unfamiliar... it is a sci-fi story on a world where Zen and the art of the sword are absolutely necessary for survival on an alien world.