If you're looking for a creepy story with otherworldly creatures, THE REPLACEMENT is for you.
Brenna Yovanoff takes the mythology of the Norse changeling and turns it just enough to set it apart. Mackie Doyle is different - we know it from the moment we meet him. Everyone else in town knows he's different too, they just ignore it to different degrees.
Watching Mackie start to falter, to struggle with himself physically and emotionally as things change, is actually as interesting as the (spectacular) world building in this debut. His differences don't pull away from the fact that he's also a teen boy (who acts like a teen boy) who is trying to figure things out when it comes to girls, school, family and life.
This book threw me off in an excellent way - leaving me feeling unbalanced as I read. If you're a fan of Holly Black's fairy stories, you'll love THE REPLACEMENT. The world is dark, but the story has hope at the end. You'll hope for a sequel - I sure do!