I'm sorry! I know how you feel, I have done this more than once. One time I found the book in the UFO bag with the rest of the project I had started using the book. Another time I found it in a small stack I had taken upstairs to look at while in the tub, lol. I have often thought I need a system to catalog my books as I have WAY too many to keep track of, but that project has not gotten to the top of the list... yet. I hope you find your book!