The Reckless Moment was never commercially released on VHS or DVD AFAIK. I have a copy of it that I got on eBay before I knew that. It's aired on TV a few times over the years (although never in my market).
It's directed by Max Ophus (Letter from an Unknown Woman, Caught, La Ronde, Madame de) and it's considered a film noir. They remade it as The Deep End. Bennett plays a woman whose daughter has been involved in a reputation ruining affair. James Mason is a blackmaiiler who gets caught up in Bennett's life and is taken by her. Bennett's part isn't showy but I love her in this. The film was made on the cusp of the fifties and in some ways offers a darker look at suburban respectability--that is, family can be as much of a trap as anything you'd find in the outside world.
If you can get your hands on a copy, I really recommend seeing it.