Dell, New York, 1988, reprint.  ISBN 0-440-44841-7.  Black and white illustrations by Mercer Mayer.  Trade soft cover, 165 pages.  Unread copy; not remaindered; pages tanned.  ‘The infamous Great Brain is home for summer vacation and ready to swindle anyone in Adenville, Utah, foolish enough to make a deal with him.  The same money-hungry mind that built Tom’s reputation as The Great Brain is undimmed by his year at the Academy.  In one short summer Tom tricks his friends out of almost everything of value that they own, outwits three clever confidence men, and finally sets up business as a river raftsman.  But when, to make 30 cents, Tom endangers the lives of two friends, his brother, J.D. decides it’s time for the Great Brain to reform.  And that’s how the trial of the kids of Adenville vs. The Great Brain took place in the Fitzgeralds’ barn one summer day.’ (from rear wrap)