This title makes it clear that despite leaving the Church, her faith is still strong and still strongly Catholic, with some interesting twists including perhaps a touch of the charismatic.
I'm not finished with it yet, but it is essentially a tale of redemption from past evil. A man experiences some attributes of heaven before being brought back to earth to help restore unbalanced situations and to grow in love through acts of heroism. I think she might be playing with the idea of how purgatory works, perhaps coupled with reincarnation. The hero isn't actually reborn, but the concept is similar.
One interesting question if this IS a conceptualization of purgatory is the spiritual temptation that continues to plague him while on missions. Clearly not a Catholic concept.
The book seems to be written with plans for a prequel. I'm looking forward to it. While not high literature, it is theologically thought provoking in an easily digestible format.