Ares Gangs In Debts. Series 1, #1

Ares is a ghost-silent, precise, and feared by every gang and syndicate that whispers his name. After years of hiding from the underworld that destroyed his family, he is forced back into the shadows when a single act of vengeance exposes him to The Circle, the most powerful criminal organization alive. Now marked for elimination, Ares is hunted by elite assassins, corrupt gang leaders, and the ruthless Collectors sent to erase him.
But Ares isn't running. He's coming for them-one by one. As buried secrets about his father and the Circle rise to the surface, Ares must decide whether he's fighting for justice. or simply feeding the monster he's become.