Fans of Grady Hendrix's novel My Best Friend's Exorcism should expect immoderate changes successful Prime Video's movie adaptation.

Star Elsie Fisher said arsenic overmuch to E! News while discussing the caller movie's Sept. 30 premiere. "That's wholly the conflict with adapting immoderate book," Elsie, who plays Abby successful the film, said. "I deliberation the operation of a movie has to beryllium a small much formulaic."

However, earlier you get excessively acrophobic astir the caller adaptation, Elsie assured E! News that the My Best Friend's Exorcism movie really tried to "stay arsenic faithful arsenic possible" to the root material. The Eighth Grade star hinted that the movie "ends connected a small spot of a higher note," whereas "the publication goes a small further successful the timeline" and offers up much of a conclusion.

For those hoping for a scene-by-scene recreation, Elsie noted, "If scenes weren't capable to beryllium included, they were inactive benignant of incorporated arsenic champion arsenic possible."

Overall, Elsie encouraged fans who aren't acquainted with the communicative "to ticker the movie first" and past drawback the publication to compare.