The Twelve is the second book in the The Passage trilogy. It continues the story of the key characters that survived Book 1 some 5 years after them reaching Roswell - and the events that occurred there. In addition, early on in the book it introduces a couple more time perspectives. One set in the days immediately after the original collapse of Project Noah and the over some 30 years before the events of the main timeline. We are provided with some new (and familiar) characters and different back stories that contribute to the overall telling of the trilogy. I enjoyed this as it gave it depth. Although I wish I had found the list of characters before I got to the end of the book!
I started this book immediately after Book 1. It is a bit darker - in terms of lows that mankind has and will stoop to. That said the story is enthralling. Within minutes of finishing The Twelve I downloaded the final book City of Mirrors.