British Author JK Rowling has revealed plans to write another 'Harry Potter' book.

The seventh novel, 'The Deathly Hollows', due out in the summer, will bring the young wizard's adventures to an end, but Rowling has said she might write an eighth for charity.

The 41-year-old writer wrote on her website: "I might do an eighth book for charity - a kind of encyclopedia of the world, so that I could use all the extra material that's not in the books."

The book would allow fans a further insight into the world of Harry Potter and his friends, including details that were not included in the best-selling novels.

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