Kingdom of the Wicked - Kerri Maniscalco - Hardcover

Kingdom of the Wicked, book 1 of 3, completed series.

Emilia and her twin sister, Vittoria, are streghe, witches who live secretly among humans, avoiding notice and persecution. One night, Vittoria misses dinner service at the family's renowned Sicilian restaurant. Emilia soon finds the body of her beloved twin desecrated beyond belief. 

Devastated, Emilia sets out to find her sister's killer and to seek vengeance at any cost, even if it means using dark magic that's been long forbidden. 

The Emilia meets Wrath, one of the Wicked, princes of Hell, she has been warned