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.
| Author | Ann M. Martin |
| Publisher | Scholastic |
| Year of publication | 1992 |
| Number of pages | 106 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 590448293 |
| ISBN-13 | 9780590448291 |
| Illustrator | Susan Tang |
| Series | The Baby-Sitters Club |
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