The Mystery of Monster Mountain #20 The Three Investigators Series

#20 in the Alfred Hitchcock and the Three Investigators Series
Blue spider end pages
149 pages 5 1/2" x 8 1/2" Hardcover 1973

The original series was published from 1964 to 1987 and comprised 43 books. Books number 1 to 9 and 11 were written by the creator, Robert Arthur , who also specified ideas for a few of the other stories. Arthur had been an editor for several book collections attributed to Alfred Hitchcock. The other authors were William Arden ( Dennis Lynds ), Nick West (Kin Platt), Mary Virginia Carey and Marc Brandel (born Marcus Beresford). All of the authors wrote their own introductions and epilogues , which were dictated purportedly by Hitchcock and later in the series a fictional writer, Hector Sebastian, who supposedly recorded the adventures of the Three Investigators from their words. The illustrators in the series began with Harry Kane and Ed Vebell and include Jack Hearne, Herb Mott, Stephen Marchesi, Robert Adragna and William A. ("Bill") Dodge.

For the original series, the specific ages of the investigators were never revealed, but contextual information indicates that they were likely 13 or 14 years old. They were not old enough to drive a car legally, but were said to be just a few years younger than their nemesis Skinny Norris, who had a driver's license from a state where the required age for
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