I’ve read the entire 21-volume Brother Cadfael series twice. Set in a 12th-century monastery and surrounding towns, it’s never too violent or horrible, and is well-written and entertaining.
The Internet Archive has multiple copies of most of these books. Whenever possible, I’ve linked to a copy that’s available for 14-day borrow.
Note 9-15-24: The Internet Archive recently lost a lawsuit brought against it by major publishers, and thus had to remove hundreds of thousands of books from its library. Some of these links thus may not work. We’ll update the page as soon as we can.
3. Monk’s Hood
13. The Rose Rent
14. The Hermit of Eyton Forest
15. The Confession of Brother Haluin
16. A Rare Benedictine: The Advent of Brother Cadfael
20. The Holy Thief