River Heights is in a complete uproar when the local zoo reports that one of its exotic and very venomous snakes has been snake-napped! It's only a matter of hours, though, before an anonymous tip leads the police to the missing critter - in the home of Nancy's friend, Charles Adams. Nancy isn't sure what to think of all this - until Charles appeals to her to help him prove his innocence. She can't resist taking the case. If he really is innocent, perhaps she can help clear his name. If he's guilty, she'll be able to satisfy herself to that fact as well.