Age range 9 to 12

When an alien named Fooz abducts Lamar and Lexie, the numbers-loving best friends prove they're human by solving a tricky math problem. But before Fooz can get them home, the two are captured by lumfurs: Bigfoot-like creatures. In order to escape, Lamar and Lexie must use their math skills to find patterns, make estimates, and decipher codes. Will they succeed?