Review: Enemies & Allies - Kevin J Anderson
Also I found interesting the view both personagens had of each other. There is a chapter were Superman debates with Batman about "How help humankind?". Superman doesn't understand Batman work as a vigilante. Batman explains that Justice is not the same thing as Law. And both things are indepent. Superman on the other hand believes in Law. That's why Superman is a Good Lawful Hero (if this was D&D) and Batman is a Good Chaotic. It was one of the best chapters.