#68 The Submarine Caper / Deadly Chase
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Vacationing in Germany does not keep Frank and Joe Hardy away from another mystery! When an inventor's mini-submarine is sabotaged and the theft of five precious, medieval paintings occurs, a valuable clue brings the young detectives to a picturesque town on the Rhine River. A sudden discovery in an old wine cellar is the first link in a hair-raising chain of events in which the boys come dangerously close to losing their lives!
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First Copyright: 1981
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0-671-42338-X
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