The Night Country (Hazel Wood 2)

Alice has fought hard for a normal life. Having escaped the Hinterland - the strange, pitch-dark world she was born into - she has washed up in New York City, determined to build a new future for herself. But when her fellow survivors start being brutally murdered, Alice must face the fact that the Hinterland cannot be so easily escaped. And that, from the shadows of her past something - or someone - is coming for her...