Harry Potter author J.K. Rowling is set to delight fans by releasing a new story based on franchise villain Dolores Umbridge just in time for Halloween (31Oct14).

The 1,700-word story will be published on Harry Potter fan site Pottermore.com and feature a back story to the dastardly villain's life.

Umbridge was introduced to readers in Harry Potter and the Order of the Phoenix, the fifth book in the seven-part series, and was portrayed onscreen by Imelda Staunton in the film adaptations.

An announcement posted on the Pottermore website on Friday (24Oct14) reads, "The new exclusive J.K. Rowling content provides a rich, 1,700-word back story about Umbridge's life filled with many new details, as well as Rowling's revealing first-person thoughts and reflections about the character."