The Seven Husbands of Evelyn Hugo,

The Spell Shop

Demon Copperhead

Two Twisted Crowns

I particularly loved the first two, as I couldn't put them down.

Demon Copperhead was a difficult read, emotionally, and I recommend reading it before or after "The Empire of Pain".

The last one is the second (and final) book of The Shepherd King series, which features a very interesting magic system along with great characters