All These Monsters by Amy Tintera

Seventeen-year-old Clara is ready to fight back. Fight back against her abusive father, fight back against the only life she’s ever known, and most of all, fight back against scrabs, the earth-dwelling monsters that are currently ravaging the world. So when an opportunity arises for Clara to join an international monster-fighting squad, she jumps at the chance.

When Clara starts training with her teammates, however, she realizes what fighting monsters really means: sore muscles, exhaustion, and worst of all, death. Scrabs are unpredictable, violent, and terrifying. But as Clara gains confidence in her battle skills, she starts to realize scrabs might not be the biggest evil. The true monsters are the ones you least expect.