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187 pages • first pub 1981 (editions)
ISBN/UID: 9780671423391
Format: Paperback
Language: English
Publisher: Wanderer Books
Publication date: Not specified
fiction
middle grade
mystery
adventurous
lighthearted
mysterious
slow-paced
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 (editions)
ISBN/UID: 9780671423391
Format: Paperback
Language: English
Publisher: Wanderer Books
Publication date: Not specified
fiction
middle grade
mystery
adventurous
lighthearted
mysterious
slow-paced
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