Looking for a book

[hils]

Ok, when I was in Texas I was looking at a Batman book. It was in hardcover and it seemed to be mostly about Bruce and Lex. I think it was fairly new. Because the book was sealed so I couldn't see if it was any good I didn't buy it, but I kind of want it now and I can't remember what it was called

Anyone got any idea what I'm talking about?

Edit: Found it! Rules of Engagement