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Hardy Boys Sinister Signpost #15
Author: Franklin W Dixon

Publisher: Grosset Putnam
ISBN: 9780448089157
Pages: 192
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It all starts when Fenton Hardy, is engaged by an experimental race car and motor designer to investigate a series of mysterious accidents. Three of his drivers have crashed because the windshields of their cars were suddenly crazed, thus cutting off forward vision. Frank and Joe uncover one slim clue. Each of the drivers had seen a signpost marked 'Danger' shortly before the accident.