MGM did not produce B movies. They produced quality movies full of stars.
Mind you, occasionally, some oddball picture did escape, like MY DEAR MISS ALDRICH, and this one, which plays like a Columbia Pictures thriller written by some one who had been reading Graham Greene and didn't take any of it seriously. Then, in typical MGM fashion, they cast it perfectly, with Edmund Lowe, always willing to play a matinée idol, and Madge Evans, who was happy to get the work. Then they cast the minor roles with comedians and told off Ray June to photograph it, who produced some astonishing proto-noir effects using, it would seem, baby spots to light the actors and leave the sets dark.
The result is a hoot and not something you'd expect from MGM. Take a look.