The Haunted Mask is the eleventh book in Goosebumps, the series of children's horror fiction novellas created and authored by R. L. Stine. The book follows Carly Beth, a girl who buys a Halloween mask from a store. After putting on the mask, she starts acting differently and discovers that the mask has become her face; she is unable to pull the mask off. R. L. Stine says he got the idea for the book from his son who had on a mask that he had trouble getting off.