“Harry Potter and the Cursed Child Parts One and Two” was “absolutely incredible,” said Grace Franzese, 17, of Greenlawn, just after stepping out of the Palace Theatre in London where she saw the much-hyped play from J.K. Rowling that is sold out through May 2017.

Franzese — a cancer survivor who, with her family, was granted tickets for a July 27 preview as her Suffolk County Make-A-Wish trip — met cast members who play Harry and Ginny Potter, Scorpius Malfoy and Albus Severus Potter outside the theater after their performance and posed for photos with them.

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Franzese was tight-lipped about the play’s plot — it’s still in previews until the official opening on Saturday. “They gave everyone buttons after Part One that say #keepthesecrets. I don’t want to be the one to accidentally say anything,” Franzese said by cellphone from London. “No spoilers allowed.”

She did say that the show “surpassed” her expectations. Franzese’s parents, Elizabeth, 48, and Pete, 52, and her two brothers, Joseph, 16, and Christopher, 11, also loved the show.

In what has been hailed as the “eighth story” in the Harry Potter saga, Harry is now a middle-aged bureaucrat at the Ministry of Magic. His son Albus Severus is heading off to Hogwarts and struggling with his father’s legacy. Critics who have seen preview shows are raving, even as they try to adhere to Rowling’s plea not to reveal spoilers. The script of the play goes on sale at bookstores at 12:01 a.m. July 31.

Franzese, who was diagnosed with cancer at age 11 and spent years in treatment, waited to choose her Make-A-Wish trip until she had “a once-in-a-lifetime opportunity,” she said.