The Righteous Mind: Why Good People are Divided by Politics and Religion by Jonathan Haidt is getting on for a decade old, but I re-read it a couple of years ago, and it still seemed pretty timely to me. It's £0.99 at Kindle UK today.
Kindle UK:
https://www.amazon.co.uk/dp/B0076O2VMI
Kindle UK/Smile:
https://smile.amazon.co.uk/dp/B0076O2VMI