There are three ways to read Underground.
1. Most convenient option:
Buy the print or ebook version at Amazon, BN.com, Waterstones, your favorite retailer/e-tailer, or borrow it from your local library.
2. Most virtuous option:
Go to your local bookstore and order it (this hopefully means they will then stock it on their shelves).
3. Book group option:
Contact Hookline and get a 25% discount for your book group.