In addition to a really good performance from Loretta Young as the increasingly desperate Ellen Jones, I give great credit to director Tay Garnett for the very effective build-up of suspense, which shifts gears partway through the movie but doesn't miss a beat in doing so. As Ellen, Young is playing a woman trying to nurse her gravely ill husband back to health. Unfortunately, George Jones' poor health has led him to become increasingly paranoid, and he's come to the conclusion that Ellen and his doctor are in love and trying to murder him. Ellen tries her best to "put on a happy face" as she deals with her increasingly difficult spouse, and then discovers that a letter she mailed for him was actually directed to the District Attorney, and accused her and the doctor of planning his murder. (As an added complication, George actually dies after the letter is sent.) The movie then shifts from George's paranoia to Ellen's desperation, as, after George dies, she frantically tries to get the letter back before it reaches the DA, but with every more desperate attempt to get the letter she seems to set herself up as more guilty. Where and how will this end?
It's a very well done movie, with a lot of little things that gave it a feel of authenticity: the nosy neighbours, and the neighbourhood kid who pretends to be Hopalong Cassidy showing up at Ellen's house looking for cookies. The opening scenes, explaining how George and Ellen met and their mutual relationship with Dr. Graham, went on perhaps a bit too long. Then, at the end, there is an expected twist (because you always expect a surprise twist in a movie like this) but the expected twist wasn't the twist I was expecting, and it provided a somewhat humorous (and perhaps, therefore, slightly out of place) ending to an overall very enjoyable film.