Mortal Sins — Michelle Belanger

The exclusive bridge between CONSPIRACY OF ANGELS and HARSH GODS, pitting the fallen angel Zack Westland against the Strega, a ruthless Italian family of witches. 

Accompanied by his temperamental (and often bloodthirsty) ally Liliana -- the Lady of Beasts -- Zack encounters the ghost of an African-American woman murdered decades ago. She cannot speak, but implores him to help her, launching him along a bloody path that leads to Mama Tuscanetti, an ancient matriarch who brooks no interference. To cross her is to court death.

Zack is one of the Anakim -- an angel belonging to an ancient tribe trapped on Earth by the cataclysmic event known as the Blood Wars. His true name is Zaquiel, and to speak it unleashes a power beyond the ken of mortal men.