Penitent's Rest

From publisher blurb:

Far from civilisation, the Shrine of Alikandara Lat—better known as Penitent’s Rest—draws the wicked and woeful from all over the world. Founded in memory of a fallen paladin, the one-time hero of her age, the shrine is a refuge for those in search of atonement for their misdeeds. The caretakers, having overcome their own sordid pasts, now watch over an ever-changing group of pilgrims who make their way to Alikandara Lat’s cenotaph. Many hope the ghost of the ex-paladin will make an appearance to help them expurgate their sins. Others, though, have less genuine reasons for their journeys…and the fiend who centuries ago seduced the paladin into evil isn’t necessarily done with her.