Peter Jameson and his friends at Cardiff Elementary want their own secret language that grown-ups won't understand, but learning a language like French or Latin would take too long. Their search for a solution finally leads them to Ethel Wingate, an eccentric old lady with an infectious smile ... and a strange obsession with green stars. She introduces them to a special language that they can begin speaking after just a week of study. When they use the language at school, however, some of the other kids start treating them differently. Ugly rumors are spread. Fights break out. And the principal clamps down with an order of "English Only!" forcing Peter and his friends to make a difficult choice.

Both children and adults can enjoy "Peter Jameson's Secret Language" and start learning the real-life "secret" language along with Peter and his friends.