You may be wondering why I would recommend a book that has precious little to do with Twin Souls. After all, Michael A. Singer's book, The Untethered Soul: The Journey Beyond Yourself, is about learning to go beyond oneself and move toward a constant awareness of the Universe/Divine. What does a book about moving away from the everyday little self and merging with the Universe/Divine have to do with uniting with your Twin Soul?
In order to be ready to unite with your Twin Soul, you need to be both less and more. You need to become less of the small, everyday self and raise your vibration to become more in tune with the higher Self. And whatever work you do to evolve, you do for your Twin as well. Your vibration will be matched, even as you work to raise it.
You see, uniting with your Twin Soul is not about looking on match.com or searching "out there," but working on your self and your Self. That's why this book is important. I hope you'll read it!