In The Stowaways, Lily and her brother Will live in a worn-out sewer. Lily wants adventure, but Will does not. When Lily finds out about a new, fancy boat, the biggest of the time, Lily can't wait to have an amazing adventure, one last time. While on the boat, Lily and Will meet a little girl, and friendship strikes. Then CRASH! People are running, screaming, and crying. The adventure turned out not so good. Lily thinks she can undo some things that...