Prunella invites Marina over for a sleepover. However, she is worried that Marina may get injured because she is blind. Marina dislikes the special treatment Prunella is giving her, and Prunella learns to treat Marina just like any other friend. D.W. finds that her snowball has returned (from the season 1 episode "D.W.'s Snow Mystery") and tries to prevent it from being stolen again. After an investigation by Brain, Arthur confesses that the snowball is actually an unflavored snow cone and that the real snowball is still lost, and that he got the fake snowball hoping D.W would end being bothered by the real one missing.