A review by earth_anduniverse
Black Holes: The key to understanding everything by Brian Cox, Jeff Forshaw

challenging informative slow-paced

3.75

This is a technical read. Would recommend knowing something about relativity before reading this. It is diagram based rather than math based (as formal physics education is) so be prepared to flip back and towards lots.
I would have personally preferred the audio book with a pdf of the graphs to look at.