Ben Farthing is really, really great at taking normal, everyday things and making them frightening. Two words that came to mind when reading this book: Lovecraftian and liminal. There is some really creepy imagery in the book, and somehow the mysterious skyscraper manages to feel both claustrophobic and limitless. The tension and the action scenes are great, and I plan to check out the other books in the series. 4.5 stars