Night of the Werecat by R.L. Stine

[Aladdin] Wendy loves anything cat-related. So when she spots the cat charm necklace in Mrs. Bast’s booth at a local cat show, Wendy can’t wait to add it to her collection. But Mrs. Bast refuses to sell it to her. It’s not just any charm—it’s a werecat charm. And it holds dangerous powers. Despite the warnings, Wendy buys it anyway. And at the stroke of midnight that night, Wendy starts to change….