The Lena in this book has grown since we last saw her in the final pages of Delirium. Pandemonium doesn't pick up where it's predecessor left off, but does flashback to fill in the gaps. That is actually one of the features that I loved about this book. The books chapters rotate between "Now" and "Then"as Lena's story unfolds. As Lena remembers her past, and deals with the present, more danger presents itself. Along with the dangers however, a few surprises cause Lena to once again question everything she has been lead to believe.
The final chapters of this novel flew by, and I really felt for Lena and the position she found herself in at the end of the book. The only bad thing I can say about this book is that I'll have to wait until 2013 to read the final installation of the trilogy.