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"The first book that ever gripped me…"
I so well remember the feeling of tension and sheer excitement as the group of child heroes strive to find the lost treasure, and so solve their grandparents' problems and save the family home. Itwas the first time I discovered that reading could fill your world. Never looked back. Tunnels, a secret summer house, and a terrific greasy baddy.
This is one of Blyton's stand-alone mysteries, not part of a series.