Presents instructions for speaking thirteen secret languages, including Pig Latin, one of the best known and easiest codes to learn, and Boontling, developed by people in a California town.

• ISBN: 9780571121052
• Author: Schwartz, Alvin
• Illustrator: Zemach, Margot
• Published: 1989 , Farrar Straus & Giroux (J)
• Themes: languages, words
• Descriptors: Information Book, Intermediate (ages 9-14), International
• No. of pages: 82