|Mrs. Marbles' Handbook For Young Detectives|
|First Appeared (cartoon)|
|First Appeared (books)|
Mrs. Marbles' Handbook For Young Detectives is a book that Fern took tips from in The Boy Who Cried Comet!. It gives techniques on noticing small details to make a good conclusion, for example: bad breath means you didn't brush your teeth, which means that you would have woken up late.