num_pages: 102
description: At her worst on April Fools' Day, Karen concocts the best April Fools' trick she has ever concocted--one that she intends to play on her entire family--but this time she may be going too far. Original.
language: English
title: Karen's Big Joke
titlecomplete: Karen's Big Joke (Baby-Sitters Little Sister, #27)
genres: Childrens
ratings_count: 276
series: Baby-Sitters Little Sister
publisher: Scholastic Paperbacks