Unbalanced

A wanna-be film producer goes crazy and on a revenge vendetta after she mentors a novice screenwriter who gains success and outshines her. It tells the story of Sarah, a wanna-be Hollywood producer, and Marilyn, an inspirational seminar leader and novice screenwriter, who learns about the industry from Sarah, finds her psychologically disturbed, and hopes to break with her after a film project falls apart, only to become a target for revenge, along with others she is close to.
A script based on the novel has also been written, and a film based on the novel is in development.