Trailer Park Elsie Fisher Has to Drive Out a Demon in My Best Friend’s Exorcism (Trailer) August 25, 2022 Based on the novel by Grady Hendrix, My Best Friend’s Exorcism follows Elsie Fisher as Abby Rivers, who begins to suspect that her best friend Gretchen (Amiah Miller) has been possessed by a demon following a trip to a remote cabin in the woods.