Summer beach-reading season is just beginning, and already several books have broken out from the pack, such as Walter Isaacson's biography of Albert Einstein, and Conn and Hal Iggulden's "The Dangerous Book for Boys."

But the biggest surprise is a blazing attack on God and religion that is flying off bookshelves, even in the Bible Belt. "God is Not Great: How Religion Poisons Everything," by Christopher Hitchens, wasn't expected to be a blockbuster. Its publisher, Twelve, a fledgling imprint owned by France's Lagardère...