(2 stars) - An overwrought melodrama
This is a Christian melodrama. Which isn't automatically a bad thing, except in this case, it is. It's overdone, & though the premise was interesting enough to draw me to try it, the characters are a bit stereotyped & come across as author puppets rather than realistic people so things just aren't very believable.
Sienna is an emotional mess suffering from scrupulosity - I was surprised to see that being addressed in a non-Catholic book. Unfortunately, combining the spiritual psychology and romance aspects to handle it is less than ideal, as any counselor will tell you. It seems like the author may have read about it in an article or layman's book and ran with it.
(Frankly, the biggest jolt I got, though, was the author referring to Luther as an "early Church Father" - I suppose Lutherans might feel that way but certainly not Christians as a whole. The early Church Fathers are those like St Justin the Martyr, St Polycarp of Smyrna, & St Ignatius of Antioch who lived in the early days of the Church & were taught by the Apostles.)
I'm afraid this is one of my rare DNFs
*Clean romance level: sweet kisses