Frank and Joe Hardy are in Germany, to visit an investigative reporter, named Gerhard Stolz, who has asked for their help following-up some leads. The plans of a top-secret mini submarine have been stolen, and a collection of long-lost paintings, just recently rediscovered, have also gone missing.
It's up to the Hardy Boys to uncover the truth, but after a deadly high-speed chase down the Autobahn and nearly getting killed in the mini-sub, they soon come to realize that two mysteries may be mor...
Frank and Joe Hardy are in Germany, to visit an investigative reporter, named Gerhard Stolz, who has asked for their help following-up some leads. The plans of a top-secret mini submarine have been stolen, and a collection of long-lost paintings, just recently rediscovered, have also gone missing.
It's up to the Hardy Boys to uncover the truth, but after a deadly high-speed chase down the Autobahn and nearly getting killed in the mini-sub, they soon come to realize that two mysteries may be mor...
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