Frederick and Ishbu live in Miss Dove's classroom, where they learn-and eat-to their hearts' content. But one fateful evening Natasha arrives with disturbing news: her father, a famous professor and scientist, has gone missing! For the second time in their lives, the rats embark on a worldwide journey. They travel the globe to save their friend and meet such colorful characters as a secret clan of badgers, two vicious rat terriers, and a stuffy English show mouse. It's another whirlwind adventure they'll never forget!