I thoroughly enjoyed The Twelve. The Passage is my favourite post-apocalyptic novel and The Twelve is a very satisfying sequel to it. At times, I did have difficulties trying to imagine some of the actions that were going on in the story. But it did not hinder my enjoyment of the book, whatsoever. I could barely put it down. Maybe they'll make a movie out of it some day. I'm looking forward to the third book.