Marvin Redpost - Is He a Girl 3 Author:Louis Sachar When Marvin's lips touch his elbow, he suddenly finds himself acting very strange. Wishing he had pigtails like his sister, Linzy. Asking to play hopscotch at recess. Even dotting his i's with little hearts in class! Sure, he may have figured out the secret difference between girls & boys .. but will Marvin Redpost ever return to normal?