Invalid George Jones is both physically and mentally ill. He mistakenly believes his wife Ellen and his doctor are having an affair and also planning to kill him. He writes a letter to his lawyer detailing their alleged murder plot. After he has Ellen give the letter to their postman, he reveals its contents to her and then threatens her with a gun. The excitement proves too much and George suffers a fatal collapse. Now Ellen must find a way to retrieve the incriminating letter.