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FILE - This Oct. 16, 2012 file photo shows author J.K. Rowling at an appearance to promote her latest book "The Casual Vacancy," at The David H. Koch Theater in New York. Harry Potter fans can look forward to a Halloween treat, with some tricks, from Rowling. In an announcement posted Friday, Oct. 24, 2014, on her web site, www.pottermore.com, the author revealed that she has prepared a 1,700 word story about the witch and former Hogwarts professor Dolores Umbridge. (Photo by Dan Hallman/Invision/AP, File) Image Credit: Dan Hallman/Invision/AP

Harry Potter fans can look forward to a Halloween treat, with some tricks, from J.K. Rowling.

In an announcement posted on Friday on her website, www.pottermore.com, the author revealed that she has prepared a 1,700-word story about the witch and former Hogwarts professor Dolores Umbridge. The story will appear on Halloween, October 31, on her site. It will include Rowling’s “revealing first-person thoughts” about Umbridge, according to Friday’s announcement.

Umbridge first appeared in Harry Potter and the Order of the Phoenix, the fifth of seven books in Rowling’s multimillion-selling series. Imelda Staunton played her in the film adaptations of the Potter books.