Murder She Said, 1961...
The name of the manor house where Miss Jane Marple conducts her inquiries is called Rutherford Hall in Dame Agatha Christie's novel. This was changed to Ackenthorpe in this movie to avoid comparison with the surname of Dame Margaret Rutherford (Miss Jane Marple)
The character of Miss Jane Marple's librarian friend, Jim Stringer, was not part of the original story (and never featured in any of the Christie books). The part was written for Stringer Davis, who was married to Dame Margaret Rutherford.