Sudden Fear.

Myra Hudson (Crawford) is a successful Broadway playwright who rejects Lester Blaine (Palance) as the lead in her new play. Lester learns that Myra is writing her will and plans to leave the bulk of her fortune to a foundation. He plots her murder in cahoots with Irene Neves (Gloria Grahame), an old girlfriend hiding in the wings. Myra discovers their plans and concocts a diabolical scheme to kill Lester and place the blame on Irene, but cannot bring herself to go through with it.