Ten-year-old Moxy Maxwell has promised to write twelve thank-you notes by the day after Christmas so that she and her twin brother Mark can go to Hollywood to visit their father, but all her brilliant ideas to help finish the task more efficiently end up creating chaos in the house.
When their parents begin saying the wrong thing every time six-year-old Sukey and her older brothers misbehave, the children discover that it is a plot and fight back with their own wrong phrases.
Daren's tendency to blame everyone but himself when anything goes wrong causes problems with his best friend, with a young neighbor who idolizes him, and with one of his basketball teammates.
Mrs. Piggle-Wiggle is back with special cures for the not truthful, the pet forgetter, the fraidy-cat, the destructive child, and the child who continually says, "I can't find it.".