About This Book
A group of teenage friends—Ralph, Harry, and Percy—pilot a swift motorboat down the St. Lawrence, running hazardous rapids and locks while investigating a mysterious gray night craft outlined in a vivid green glare. Their pursuit leads them to Montreal, island outposts, and ruined structures where explosions, a hospital rescue, and encounters with conspirators complicate the search. The narrative follows their detective work, narrow escapes in storms, a chase involving a stolen skiff and a hidden tunnel, and a final confrontation that resolves the mystery, emphasizing loyalty, courage, and practical resourcefulness.
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