DrWatson
Well Parky, a very subjective topic (!), but if a light detective novel is OK, why not see the Cadfael series, by Ellis Peters? They were on TV (Derek Jacobi in the lead), but tell a nice story.
Someone has mentioned Wodhouse, and the Ladies Detective Agency has lots of humorous touches.
I also rate the Cadfael series really highly, they are the first "big" historical novel series and imo still one of the best (and simple plot wise) rather than later historical fiction, and you can buy them on Amazon.
If you like a spot of very entertaining (but still accurate history, why not go back the the Russo series, he is a Doctor in Roman Britain, wit and a good story line.
Or the delightful and also easy read Burren Mysteries, a historical mystery book series by Cora Harrison. It follows Mara, a female judge and Brehon (ancient Irish legal arbiter) living in the 16th-century Burren region of western Ireland