One excellent book on consciousness is Mcginn's The Mysterious Flame [1]. I knew consciousness is a hard problem, but the book made it clear how baffling and utterly mysterious it is. I am still absolutely flabbergasted when I think about it (how on earth does consciousness arise from material "meat"?! [2] Where are pain and color and subjective experience really located in the material universe?). It also made me skeptical of people who think AI will be sentient [3] while we are in the complete dark about consciousness in biological organisms.

[1] https://www.amazon.com/Mysterious-Flame-Conscious-Minds-Mate...

[2] https://www.mit.edu/people/dpolicar/writing/prose/text/think...

[3] https://twitter.com/lexfridman/status/1653051310034305025