Fifth-grader "Encyclopedia" Leroy Brown solves ten mysteries and, by putting the solutions at the back of the book, challenges the reader to do the same.

The case of the secret pitch -- The case of the balloon man -- The case of the ambushed cowboy -- The case of the forgetful sheriff -- The case of the hungry hitchhiker -- The case of the two-fisted poet -- The case of the wounded toe -- The case of excalibur -- The case of the glass of ginger ale -- The case of the stomach puncher.