No Road Back (1957)

Mrs. Railton, who happens to be blind and deaf, somehow manages to run a private club, as well as acting as a fence for baddie Clem Hayes and his gang of misfits. After one of the gang gets caught during a heist, Mrs. Railton tells Clem that they'll need to cool it for a while.
But Clem has different ideas, and reveals details relating to a diamond consignment worth £250,000 that is coming over from Amsterdam.
He reveals where the diamonds are being stored, and has floor plans of the building, so the gang can be in and out with no problems.
The heist goes ahead, and everything runs smoothly, except..., a night watchman ends up dead. Panic sets in amongst Railton, Hayes and the gang, as the thought of facing murder charges sends everyone into panic mode, and the saying, "Honour Amongst Thieves" goes out the window.
Far fetched basis regarding Mrs. Railton's character, but fairly entertaining crime thriller, with a very early role for Sean Connery.