Nancy’s class is performing *Alice in Wonderland* , and everyone is busy practicing for the big day. Rehearsals are running smoothly until the Mad Hatter, pesky Orson Wong, discovers that his “magic” hat has *vanished.* How will the Mad Hatter remember his lines without it? Sounds like a case for Nancy Drew. But Nancy’s not so sure she wants to solve this one—Orson is such a pest! Even worse, Orson wants to help Nancy solve his own case, and Nancy’s friends won’t even investigate the case if he’s around. Will a new partner mean saying good-bye to old friends? And can Nancy and Orson uncover the Hatter’s hat before curtain time?