There's Someone Inside Your House is a horror novel by American author Stephanie Perkins, published on September 12, 2017, by Dutton Books.

[3] MJ Franklin of Mashable praised the novel, stating that it is a great homage to "classic slasher movies like Scream and I Know What You Did Last Summer".

[4] Christina Ledbetter from The Washington Times praised the book, mentioning that the elements of "teen romance and grisly murders crawl into the backseat of the car for a make-out session, producing a read that is as eerie as it is delightful.

[7] After an official announcement, it was confirmed that Shawn Levy, James Wan, Dan Cohen and Michael Clear would serve as producers on the film.

[9] In August 2019, Sydney Park, Théodore Pellerin, Asjha Cooper, Dale Whibley, Jesse LaTourette, Burkely Duffield, and Diego Josef were set to star in the film.