After learning about the idea of an "evil twin" from a Detective Dirk novel, Harvey begins to worry that Fee or Foo might have been born an evil twin! The kids of Littlebark Grove speculate which twin (Fee or Foo) was born the evil one. Each kid shares a story of an example of one of the twins acting "evil." Rooter thinks Fee is evil because she's always giving him looks that creep him out. Technobear thinks Foo is evil because he fights trees. Piri Piri saw them working together to steal food one time...are they both evil? Finally, Harvey's worries are extinguished. They're both good twins! But as Harvey walks off, the twins attack the group, playfully wrestling. Dade shouts they're both evil! Plus more stories about Harvey and his (evil or not evil) pals, as they figure out life and friendship.