Leroy "Encyclopedia" Brown lives in the fictional Idaville, Florida, where his father is chief of police. Whenever a case arises (often one that is stumping his father), Encyclopedia Brown swings into action, assisted in his investigations by his friend (and "muscle") Sally Kimball. The recurring "villain" is neighbourhood bully Bugs Meany.
Books featuring this character are subdivided into a number of (possibly interlinked) short stories, each of which presents a mystery. The mystery is always intended to be solved by the reader, thanks to the placement of a logical or factual inconsistency somewhere within the text. Encyclopedia Brown invariably solves the case by exposing this inconsistency, but this part of the story is placed at the end of the book; the bulk of the story ends just at the moment when readers are invited to solve the case themselves, or flip to the section in the back with the answers.
The enduring popularity of the Encyclopedia Brown books stems at least partially from the author's refusal to talk down to his audience (which consists primarily of younger readers), as far as leaving clues and puzzle pieces in each short stories. Adult readers who browse through an Encyclopedia Brown story often find that the mysteries are just as difficult for adults to solve.
Other similar book series are those of the Hardy Boys, Nancy Drew, and The Great Brain.
The Encyclopedia Brown books, in order of publication, are: