Which London stage play had its story developed by J.K. Rowling, Jack Thorne and John Tiffany?

The London stage play developed by J.K. Rowling, Jack Thorne, and John Tiffany is Harry Potter and the Cursed Child.

The production is set nineteen years after the events of Harry Potter and the Deathly Hallows. It follows an adult Harry Potter, now working at the Ministry of Magic, and his son Albus Severus Potter as they face tensions involving family expectations, friendship, and the past.

Jack Thorne wrote the script, while John Tiffany directed the original production. Rowling contributed the story and creative development, but the play is not an eighth novel written by Rowling. That distinction is important because the published script is a stage-play text rather than another installment in the original seven-book series.

The play began previews in London in 2016 at the Palace Theatre. It was initially presented in two parts, although later productions have also used a one-part format.