The Skyfire Puzzle

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The Skyfire Puzzle is no. 85 in the Hardy Boys series and no. 36 in the Mystery Digest series, written by Franklin W. Dixon.

[edit] Plot summary

Frank and Joe are called from a stakeout with their father Fenton, who is chasing a group of industrial saboteurs. A friend of Mr. Hardy's at NASA, Harry Stone, is baffled by a series of accidents involving a new shuttle called Skyfire. Frank and Joe take to space to solve a farflung conspiracy that could ruin Stone and NASA and possibly kill them both.