Paladin of Souls

This was a great addition to the Chalion series. Although you don't need to have read The Curse of Chalion to get into this one, you'll get spoilers for the first book and (more importantly) miss a lot of the background theology by skipping it.

Paladin of Souls ticks a lot of boxes for me, in the same way The Curse of Chalion did: Kick-ass women, interesting world-building (in this case the theology), a bit of romance, and a happy ending.