I’d recommend Neverwhere by Neil Gaiman.
It fits fantastical, I think and it’s also listed as sci-fi, but not sure it is.
It’s the book I suggested to a mate of mine who wanted to get back into reading again. He loved it so much that he bought a 2nd proper copy with illustrations by Chris Riddell, my favourite illustrator.
Dissolution by C. J. Sansom. It’s my favourite book :)
Set in England during the reign of Henry VIII and the dissolution of the monasteries, it follows a lawyer called Matthew Shardlake who is tasked to solve the murder of one of Thomas Cromwell’s commissioners at Scarnsea monastery.
The series touches on the tenuous nature of politics and religion/faith of the time, amongst other things and how peoples lives were affected.