A dull murmur, like distant thunder, reached their ears and brought Biggles to his feet with a rush. 'What is it?' he gasped.-At the first sound Dickpa had leapt for the flashlight. Ah - stop!' he screamed. A visit to Biggles' uncle, Dickpa, lands Biggles, Algy and mechanic Smyth in a dangerous adventure looking for an ancient Inca treasure hoard.
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