"An Ambush of Shadows" is the fifth book in the classic series of post-apocalyptic novels about the people of Pelbar. Despite the tentative peace established in the eleven hundred years since the destruction of the United States, the Tantal tribe remains ready for battle. After their disastrous defeat by the Pelbar tribes at Northwall, the slave-holding Tantal have kept their distance. But since the Pelbar forces began moving northward to colonize the shores of the Bitter Sea, the Tantal forces have been on the attack. Then one day, a roving tribe of Tantal warriors kidnaps a young girl during a raid on Pelbar explorers. The child is Raydi, daughter of Stel Westrun, Pelbar master craftsman, reinventor of the steamboat, and son of the leader of the Pelbar city-state Pelbarigan. Stel vows to reclaim his daughter and seek revenge, becoming the single-minded foe of all things Tantal. In addition to the Pelbar series, Paul O. Williams's works include "The Man from Far Cloud", "Outside Robins Sing: Selected Haiku", "The Nick of Time: Essays on Haiku Aesthetics", and several other books. Williams is a professor emeritus of English at Principia College and lives in Hayward, California.