It turns out that I'd suggest Theodore to any middle grade reader with a desire to help out a friend. Although Theodore does have an interest in courthouse procedures and happenings he's more interested in solving problems and seeing justice done and sometimes that means a little finagling.
Of course, things are always done legally. (That's a given when you come from a family of lawyers.) That said, Mr. Grisham definitely doesn't use this series as an excuse to cheat the reader on plot detail, developments or twists. It is very much a tribute to his talents and his respect for his readers.