Zero (Masks: Book 1)

Since witnessing her father’s murder when she was twelve, Iris Bloom has come to hate her town and all the crime in it. However, she never knows how to act on her emotions. She takes many classes, including martial arts, in an attempt to suppress her anger. However, she finds a different use for them when she meets Raven, an anti-social and mysterious boy with equal training. They decide to fight crime together, but how can they trust each other when each is keeping secrets from the other?