Once I started this book, I couldn't quit. I was sure that Jack would find a way out of his predicament and I had to find out how he managed it. I loved every single page. Although the emphasis of the book description is on the supernatural elements of the book, Nightfall does not really fall neatly into a single genre. Yes, the supernatural figures prominently, but the book is, at heart, a mystery, with Jack, in true private investigator fashion, doggedly following one lead to another to another in his efforts to unravel the puzzle dropped in his lap by a man who claimed to be his father. Add in a few discussions of philosophy and religion (What happens after you die? What is the meaning of life?) and more humor than I expected and you get a pleasing, well rounded story.