This chapter book in Newbery Honor-winning and bestselling author Louis Sachar's Marvin Redpost series is getting magical...or is it? Marvin Redpost has a girlfriend--not a real girlfriend, just a girl who is a friend. And Casey Happleton is no ordinary girl. She lives in an old firehouse and she has a magic crystal She wants to share the crystal with Marvin. Could the crystal really be magic? Or is Casey putting her own spell on Marvin? Hilarious...