The director is the screenwriter of many horror film masterpieces, including the "Chain Saw" and "Dead Silence" series, so there is no problem with the plot design.
However, there are two places that feel a bit counter-common sense. One is that the hostess was repeatedly harassed by evil spirits while sleeping alone. Later, her family also knew about it, but they still let her sleep alone, which is unreasonable. In "Calling the Souls 2", after the child is harassed by evil spirits in the play, her mother decisively took her family and hid in a neighbor's house.
The second point is that Aunt Mei’s strength in front of ghosts was very weak at first, and her soul was almost killed by the witch when she came out of her body, but then she just relied on her heart to tell herself that I was strong, as if suddenly she had the ability to defeat ghosts. One can push the ghost far away. If power is so easy to obtain, why not use it in the first place.
In addition to these two points, overall it is worth watching for horror film lovers.
View more about Insidious: Chapter 3 reviews
