How does the author use allusion in the novel, The Woman in the Window?

The author uses the movie, Gaslight, is an allusion that is particularly suited for this novel because it is a movie in which the heroine slowly goes insane. At first, it appears Anna is going insane because of her own irresponsibility in taking her medications but it is later learned that Ethan has been behind a good deal of the strange things that have been happening to her. It is for this reason that the movie Gaslight is particularly significant because the heroine’s husband is intentionally doing things to make his wife become insane. Ethan and Alistair intentionally cover up the murder that Anna saw, making the police believe that she hallucinated it. Ethan continues to go into Anna’s house and do things like changing the code to her phone and taking a picture of her sleeping and sending it to her. When Anna tells the police these things are happening, they tell her they cannot prove it was not Anna doing the things to herself. By refusing to believe Anna, the police contribute to Anna’s feeling that she is losing her grip. They even go so far as to convince her that she made up the woman whom she believed she saw murdered.