As Christmas approaches, Caroline Malloy continues the feud between her sisters and the Hatford brothers by making Wally Hatford be her partner for a special project at school.

April Fools' Day is not a happy one for Wagner the mouse because his best friend, Pearl the rabbit, and other children and adults at school keep tricking him.

Disgusted that a family with three girls moves into the house across the river, nine-year-old Wally and his three brothers declare a practical joke war on the girls.

April Fools' Day is long and hard for the third-grade Huit octuplets, but it is nothing compared to the challenges of Tax Day, through which Jackie discovers her special power and gift and learns more about their parents' mysterious disappearance.

A series of practical jokes at a restored nineteenth-century farmhouse makes the Aldens wonder if the ghost of its builder is at work.

Bradley and Brian need help from Nate and Lucy after a hypnotist turns their mother into a duck but does not quite get her changed back.

Fourth-grader Iggy Frangi and his friends, afraid the principal saw them pulling a big prank, vow to be so good they are invisible, but learn that being too good causes trouble, too.

KYLIE. He started our war ; I intend to finish it. Buying a house in the suburbs was supposed to be low stress--my own little haven to decorate and landscape exactly how I want. Instead, I find myself locking my garbage can to keep pests out-pests that are six-foot-one, green-eyed, and far too good-looking. My trespassing neighbor is rude and entitled. It isn't long before war is declared, and I find myself stooping to immature pranks. When trouble...

When cousins Mike and Kate go to Kansas City for the All-Star game, they meet the son of the American League starting catcher who stands falsely accused of playing practical jokes on his All-Star teammates.

"Claudia's not worried when she hears her newest babysitting charge, Betsy Sobak, is a great practical joker. After all, how much harm can one little girl do? Plenty. Claudia breaks her leg as a result of one of Betsy's mean jokes--and now she's talking about quitting the club. Babysitting, she says, is just too dangerous. Kristy thinks Betsy needs to be taught a lesson. She also thinks the Babysitters are just the ones to do it. Watch out, Betsy...