Cover title. - With answers.
Bibliography: p.46. _ Includes index.
Contents: The KnowHow book of spycraft / by Falcon Travis and Judy Hindley. Originally published: 1975 - The KnowHow book of detection / by Judy Hindley and Donald Rumbelow. Originally published: 1978.
The KnowHow book of spycraft & detection : secret codes, tricks, disguises, games and puzzles. ISBN 0860201619. Published by Usborne in 1979. Publication and catalogue information, links to buy online and reader comments.