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.
"synopsis" may belong to another edition of this title.
Book Description Pocket Books, New York, New York, U.S.A., 1986. Trade Paperback. A good plus trade paperback. Water damage. The Hardy Boys #68. Bookseller Inventory # 2PB19559
Book Description Wanderer Books 1986-07, 1986. Hardcover. Book Condition: good. 067142338X. Bookseller Inventory # 490114