LONDON (AP) — There are fans with wands and wizard costumes, midnight book parties and throngs of excited muggles. Harry Potter's magic is back.

Nine years after J.K. Rowling's final novel about the boy wizard, Harry has returned, on the stage and the page — and he's still producing commercial alchemy.

"Harry Potter and the Cursed Child," a two-part stage drama that picks up 19 years after the novels ended, has its gala opening Saturday at London's Palace Theatre, and is all but sold out through December 2017.

Booksellers expect a bonanza when the script is published Sunday. Thousands of bookstores around the world are holding Potter parties Saturday night, and report advance sales not seen since the 2007 publication of "Harry Potter and the Deathly Hallows," the final novel in the series.