Share this Page P.J. McMahon 0 Total Resources 1 Books Books by P.J. McMahon 1 Sort by Number of Resources Number of Awards Book Title Year Published Word Count Reading Level: ATOS® Reading Level: Lexile® Add Multiple Titles to Reading List Browse books by P.J. McMahon The Mystery of the Swimming Gorilla: Secret File #1 by P.J. McMahon and John Manders 4 Resources Add to Reading List Share this Book Images courtesy of publishers, organizations, and sometimes their Twitter handles.