A couple of years ago, I read and enjoyed David Sacks's book Language Visible: Unraveling the Mystery of the Alphabet from A to Z. It was a fun exploration of the history of the writing systems that preceded the English 26-letter alphabet, though it was definitely aimed at a popular rather than a technical (i.e. linguistics) audience. Recently I was browsing through the Linguistics section at my local bookstore and came across a more recent book that looked like it covered similar ground, titled Letter Perfect: The Marvelous History of Our Alphabet From A to Z. Before I bought it, though, I fortunately noticed that the cover design of Letter Perfect was suspiciously similar to that of Language Visible. It turns out they're the same book, which has been mysteriously retitled for the paperback edition.
What's up with that? Do publishers retitle books like this all the time and I've never noticed it? It seems like a bit of a deceptive practice.