Vicious (Villains, #1)

by V.E. Schwab

But these words people threw around—humans, monsters, heroes, villains—to Victor it was all just a matter of semantics. Someone could call themselves a hero and still walk around killing dozens. Someone else could be labeled a villain for trying to stop them.

Plenty of humans were monstrous, and plenty of monsters knew how to play at being human.

“When no one understands, that’s usually a good sign that you’re wrong.”

“You can’t kill me, Victor,” said Eli. “You know that.” Victor’s smile widened as he buried his knife between Eli’s ribs. “I know,” he said loudly. He had to speak up over the screams. “But you’ll have to indulge me. I’ve waited so long to try.”