Elements of Evil - Arnold Brooke

Bernice is a science-loving girl with an adorable hedgehog but also with a big problem: being overshadowed by her perfect older sister, Edith. Bernice decides that the science fair is the best place for her to make a stand, and also to do something that Edith has never done before—become a supervillain! But a supervillain needs a good nemesis and so Bernice must find hers just in time to make a big splash. First the science fair. Then the world! It’s a book filled with secret codes, evil schemes and science in one girl’s quest to become great.