Magic or Madness — Justine Larbalestier

For fifteen years, Reason Cansino has lived on the run. Together with her mother, Sarafina, she has moved from one place to another in the Australian countryside, desperate not to be found by Reason's grandmother Esmeralda, a dangerous woman who believes in magic. But the moment Reason walks through Esmeralda's back door and finds herselfon a New York City street, she's confronted by an unavoidable truth -- magic is real.