Unable to think of an idea for a science fair project, Arthur borrows a model his father made in third grade but feels bad about it even before he gets into trouble.

After playing with Miss Finn's discarded boxes and making a mess, her young neighbors first lie about their misdeed and then make things right.

Nancy writes a report for school about her great-grandfather, making things up so he seems less ordinary, but when she learns that Grandpa will be there to hear her read the report aloud she realizes she was dishonest.

Junie B. Jones experiences glee while showing off her new furry mittens in kindergarten, but disaster strikes when they disappear from the playground.

When Mallory cannot decide what to be on Career Day, it makes her feel like she is not good at anything and she ends up telling a lie that quickly gets out of control.

When Matthew has nothing for show-and-tell one day, he tells the class that he has a lion living at his house, but when his classmates want to come see it he must decide what to do.

When Franklin lies about being able to swallow seventy-six flies in the blink of an eye, his friends ask him to prove it.

Fourteen-year-old Kevin is very good at lying and doing so makes life easier, but when he finds himself in big trouble with his friends, family, and teachers, he must find a way to end his lies forever.

Ben has so often tried to convince people he has seen Bigfoot that when a real yeti arrives and borrows his bicycle, no one comes to see if Ben is telling the truth.

In 1974 at her new San Francisco school, nine-year-old Julie does not want to tell her class about her parents' divorce, or to tell her sister about messing up her school assignment, but when she breaks her finger playing basketball and her whole family rallies around her, she realizes the importance of telling the truth.