This book is about absent-minded Dr. Kokintz, U.S. atomic scientist, who invented the quadium bomb triggered by his landlady's hairpin. The bomb was captured for Duchess Gloriana XII by her expeditionary force of 20 longbowmen who invaded the world's largest city under their flag where one head says "yes," one "no," and frightened American civil defense workers who thought them men from Mars. This brought instant retaliation from the U.S.A. in the form of a senatorial investigation.