Premi put me onto this on another forum. You can read a few pages for free on Amazon with the 'Look inside' thing. I've just read a few pages and like what I've read thus far.
Check it out!
https://www.amazon.co.uk/Patshahi-Mehima-Revisiting-Sikh-Sovereignty/dp/1838143734/ref=sr_1_1?qid=1643480328&refinements=p_27%3ARanveer+Singh&s=books&sr=1-1&asin=1838143734&revisionId=&format=4&depth=1