Reddit’s dark corners are once again headed to the big screen, with Euphoria star Sydney Sweeney and Dune co-writer Eric Roth leading the charge. The two are teaming up for a new thriller based on a viral Reddit thread titled “I Pretended to Be a Missing Girl So I Could Rob Her Family” — a chilling tale about deception, identity and a scam gone too far. With Sweeney producing and starring and Roth penning the script, the project is already drawing major buzz despite being in early development.

Joe Cote — an English teacher in Massachusetts — took to a sub-Reddit four years ago and penned a chilling story about a girl who used a family’s heartache as a tool to infiltrate their home and rob them. It was well-received on the site, with almost 4,000 upvotes and hundreds of comments under the post talking about it. Many said a missing person...