"I've long thought about how life is influenced by death, how it influences what you believe in and what you look for. Yes, I think I was pushed in a way to write this book by certain spirits — the yin people — in my life. They've always been there, I wouldn't say to help, but to kick me in the ass to write. ...Yin people is the term Kwan uses, because "ghosts" is politically incorrect. People have such terrible assumptions about ghosts — you know, phantoms that haunt you, that make you scared, that turn the house upside down. Yin people are not in our living presence but are around, and kind of guide you to insights. Like in Las Vegas when the bells go off, telling you you've hit the jackpot. Yin people ring the bells, saying, "Pay attention." And you say, "Oh, I see now." Yet I'm a fairly skeptical person. I'm educated, I'm reasonably sane, and I know that this subject is fodder for ridicule. ... To write the book, I had to put that aside. As with any book. I go through the anxiety, "What will people think of me for writing something like this?" But ultimately, I have to write what I have to write about, including the question of life continuing beyond our ordinary senses."