Scientist Dr. Henry Jekyll believes every human has two minds: one good and one evil.  He develops a potion to separate them from each other.  Soon, his evil mind takes over, and Dr. Jekyll becomes a hideous fiend known as Mr. Hyde. These reader-favorite tiles are now updated for enhanced Common Core State Standards support, including discussion and writing prompts developed by a Common Core expert, an expanded introduction, bolded glossary words and dynamic new covers.