Heart of Malice by Lisa Edmonds

The first time Moses Murphy’s granddaughter killed on his orders, she was six years old.

For twenty years, she was a prisoner of an organized crime syndicate, forced to use her magic to make Moses the most powerful and feared man on the East Coast. To escape his cruelty, she faked her own death and started a new life as Alice Worth. As a private investigator specializing in cases involving the supernatural, Alice walks a precarious line between atoning for the sins of her grandfather’s cabal and keeping her true identity hidden.

Hired to investigate the disappearance of a mysterious object of power, Alice enlists the help of Malcolm, a ghost running from a past as nightmarish as her own. It soon becomes clear the missing object was taken by someone with a dangerous secret and an unknown agenda. When her client is kidnapped, Alice must find her and the object of power before a vengeful killer destroys the city and slaughters thousands—starting with Alice.