Set of six books from the Alfred Hitchcock and the Three Investigators series. Includes titles 'The Mystery of the Vanishing Treasure' ISBN 000691781X 1980; 'The Secret of Skeleton Island' ISBN 0006919189 1982; ‘The Mystery of the Fiery Eye’ ISBN 0006918646 1982; ‘The Mystery of the Flaming Footprints’ ISBN 0006921043 1982; The Mystery of the Shrinking House’ ISBN 0006918700 1981; ‘The Mystery of the Invisible Dog’ ISBN 000692011X 1982.
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