This film plays really well with an audience. Especially once the chase begins. Plus, Trevor Howard with his sensible, smart charms and Jean Simmons with her innocent demeanor and piercing eyes are terrific together.
The film starts as a psychological drama but after the murder it segues into a chase thriller as the two leads head for the border. Some may think the chase is superfluous but actually the chase is essential because it aids in clearing the mind of the Jean Simmons character by getting her out of the oppressive household, plus it helps bring out the real killer - who is suddenly put into such a position that they have to finish the job. The killer rightly believed that once the Simmons character was arrested she would be put away. And it is true that her lack of control in the household - as well as evidence pointing her way - there is no way she would have gotten out of the murder charge. The chase that ensues helps bring out the truth.
This is an entertaining film. Seek it out if you can find it.