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187 pages • first pub 1981 (view editions)
ISBN/UID: 9780671423398
Format: Paperback
Language: English
Publisher: Not specified
Edition Pub Date: Not specified
Description
On a visit to Germany the Hardy brothers investigate the theft of plans for a newly invented submarine and the mysterious disappearance of valuable coins and paintings.
Community Reviews
Content Warnings
187 pages • first pub 1981 (view editions)
ISBN/UID: 9780671423398
Format: Paperback
Language: English
Publisher: Not specified
Edition Pub Date: Not specified
Description
On a visit to Germany the Hardy brothers investigate the theft of plans for a newly invented submarine and the mysterious disappearance of valuable coins and paintings.
Community Reviews
Content Warnings