Daniel Howat’s review published on Letterboxd :
A Simple Favor brings a delightfully twisted mystery that mostly succeeds, thanks to a wonderful cast. Anna Kendrick is always excellent.
The movie is a tonal mess, blending comedy and drama to puzzling results, but the story is entertaining and keeps you reeled in. It works in spite of a bland visual style, uneven pacing, and a really ridiculous third act.
There are plenty of problems to complain about with this movie, but I was honestly entertained for the most part.