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.
Evan doesn't like baby-sitting his cousin Kermit because Kermit likes to play mean practical jokes on Evan and his friend, Andy; but Andy has found something that will teach Kermit a lesson once and for all.
Pumpkinhead sets out to see if the rest of the world is the same as Pumpkintown, but because of some tricky squirrels, neither he nor the rest of his town finds out.
The Benson boys return to Buckman for spring vacation and concoct a prank involving a non-existent ghost, continuing the practical joke war between the Hatford boys and the Malloy girls.
Despite a New Year's resolution to be nice to their neighbors the Malloy girls, the Hatford boys find themselves continuing their rivalry and war of practical jokes.
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.
The Hatford brothers cannot imagine spending Thanksgiving dinner with the Malloy sisters as the practical jokes and rivalries between the two families continue.
