Monsters of Verity Series by Victoria Schwab

Kate Harker is a girl who hunts monsters. And she's good at it. August Flynn is a monster who can never be human. Nearly six months after Kate and August were first thrown together, the war between the monsters and the humans is a terrifying reality. In Verity, August has become the leader he never wished to be, and in Prosperity, Kate has become the ruthless hunter she knew she could be... moreKate Harker is a girl who hunts monsters. And she's good at it. August Flynn is a monster who can never be human. Nearly six months after Kate and August were first thrown together, the war between the monsters and the humans is a terrifying reality. In Verity, August has become the leader he never wished to be, and in Prosperity, Kate has become the ruthless hunter she knew she could be. When a new monster emerges from the shadows -one who feeds on chaos and brings out its victim's inner demons- Kate must face a monster she thought she'd killed, a boy she thought she knew and a demon all her own …. less