This image is an example of what I would have binned without thinking twice.

Massively underexposed as the flash did not fire

However, I decided to play around with this image in my favourite raw converter and came up with this.

A usable image, at least in black and white after some fiddling on the raw file

I basically changed the ICC profile, lifted the shadows and brightness, pushed the exposure by 3 1/3 f-stops and added a -2/3 f-stop vignette.
Finally, I converted the image to black and white, added some clarity to enhance the contrast and applied one of my cinematic styles (MikeRhys Cinema Style 06) on a separate layer with 70% opacity.

Not bad for an image that seemed to be unusable at first glance.