327 pages
English language
Published Oct. 13, 1949 by Macmillan.
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A peaceful vacation in the Welsh mountains seems sure to keep the children out of trouble, but the mystery of a rumbling mountain soon has them thirsty for more adventure.
Philip, Dinah, Lucy-Ann, and Jack are determined to explore the mountain and uncover its secret, but first they must escape from a pack of ravenous wolves and a mad genius who plans to rule the world!