It was only one of the many caves along that particular part of the Atlantic coast of northern Spain. Dick Garland had explored lots of them, but not the Cave of the Angels. His Spanish friends were evasive about that one grotto, and when the young countess Lola dared him to spend the night there alone, he had to accept the challenge.

As a result, Dick's entire life was to change, because there was something in the cave--something improbable, overwhelming and terrifying--and it very nearly cost not only Dick's life, but that of his older brother, of Lola, and of some of the finest seafaring men in all Asturias!

[Originally published in 1936 as The Terror of the Villadonga.]