Harry Potter and the Cursed Child,” the Harry Potter play due to open in the West End in the summer of 2016, will be a two-part epic set 19 years after J.K. Rowling’s seventh Potter novel, “Harry Potter and the Deathly Hallows,” and will feature a storyline that revolves around an adult Harry and his youngest son, Albus.

“It was always difficult being Harry Potter and it isn’t much easier now that he is an overworked employee of the Ministry of Magic, a husband and father of three school-age children,” reads the summary of the project revealed by Rowling and her team of theater collaborators, director John Tiffany and writer Jack Thorne. “While Harry grapples with a past that refuses to stay where it belongs, his youngest son Albus must struggle with the weight of a family legacy he never wanted. As past and present fuse ominously, both father and son learn the uncomfortable truth: sometimes, darkness comes from unexpected places.”

The play will be presented in two full, evening-length parts. On some days of its playing schedule, “Harry Potter and the Cursed Child” will play Part I at the matinee and then Part II in the evening.

The new details of the show, which will have a cast of more than 30, come after initial announcements of the project suggested the storyline would be more of a prequel that focuses on Harry’s early years. The new play is based on an original story by Rowling, Thorne and Tiffany.

“Harry Potter and the Cursed Child” will be produced by Sonya Friedman Prods. (“Jerusalem,” “The River”), Colin Callender’s Playground Entertainment (“Lucky Guy”) — two transatlantic producers whose work will be familiar to Broadway audiences — and Harry Potter Theatrical Prods. Tiffany won a Tony for his direction of musical “Once” and also directed the 2014 Broadway staging of “The Glass Menagerie.” His work with Thorne recently got a New York City showcase when their stage adaptation of “Let the Right One In” played at St. Ann’s Warehouse in Brooklyn.

Preview performances of “Cursed Child” begin June 7 at the Palace Theater ahead of a July 30 opening for both parts.