The Five Masks of Dr. Screem

 The Five Masks of Dr. Screem was the third book in the Hall Of Horrors book series. It was preceded by Night of the Giant Everything and followed by Why I Quit Zombie School.

Plot
It is Halloween and Monica Anderson and her little brother have just gotten involved in a terrifying adventure that will pit them against the evil Dr Screem who wants to obtain five sacred masks with the power to manipulate the world around them.