Director Richard Tanne was so moved after reading Krystal Sutherland's 2016 novel Chemical Hearts that he immediately began writing a script to adapt it. "I didn't know really anything about it, except that it moved me enough to finish it before we even had the rights," Tanne tells The Hollywood Reporter.
The director was sent the book by Riverdale star Lili Reinhart who was looking to adapt the YA story. After meeting with the actress in Vancouver, while she was shooting for the CW series, the two bonded over their shared visions for a potential film, eager to bring in elements from other works such as the color palette of Alfred Hitchcock’s Vertigo or the naturalistic performances from Gus van Sant films.
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