Kingdom of the Wicked by Kerri Maniscalco — book slip

Emilia and her twin sister Vittoria are streghe—witches living secretly among humans in Sicily. When Vittoria is brutally murdered, Emilia is devastated and determined to find her sister's killer.

Her quest for vengeance leads her to Wrath, one of the Wicked—demon princes of Hell. Despite being warned about the Wicked, Emilia forms an uneasy alliance with Wrath, who claims to be on her side.

As they delve deeper into the mystery of the murders, Emilia must navigate a world of dark magic and forbidden desires.

First in the Kingdom of the Wicked series.