Which Mary Higgins Clark novel is this based on?
I cannot find a novel by her with this title. Netflix says it's based on the novel "Queen of Suspense" which is her nickname, not a novel AFAIK. I haven't read all of her books yet and I haven't seen this movie yet, so I have no way of figuring this out.
And if it's based on her novel, why is she not listed on IMDB as one of the writers?