A missing scientist, a smoke filled square and a mysterious coded message launch Lucy and Jack into a daring and dangerous mission. Illustrated throughout in colour and black and white a new title in the USBORNE PUZZLE ADVENTURES series. Also available in paperback priced at 3.50, ISBN 0 7460 0510 5.

The Invisible Spy 1999, E.D.C. Publishing

ISBN-13: 9780881104042

Hardcover

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The Invisible Spy 1994, E.D.C. Publishing

ISBN-13: 9780746005101

Trade paperback

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Invisible Spy 1993, Usborne Publishing Ltd, London

ISBN-13: 9780746005118

Hardcover

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