It is possible that:
* The title is incorrect: Perhaps you are thinking of a different film or TV show with a similar title.
* The release year is incorrect: There might be a film called "Letters to a Stranger" released in a different year.
To help me identify the correct film, could you please provide any additional details you remember, such as:
* A brief plot summary
* Any other actors you may remember
* The genre of the film
With more information, I can assist you in finding the correct cast list.