Pandemonium

Lauren Oliver picks up where Delirium left off, with Lena now on the other side of the wall, surviving among the Invalids. Pandemonium splits its time between her present, learning to live in the wild, and a parallel timeline several months later when she’s been pulled into resistance work in the city.

The alternating structure is a deliberate choice. It builds tension by giving you Lena at two different points in her transformation and letting you watch how the gap got filled in.

New characters arrive. Old questions hang. The romance plot from book one gets complicated in ways that fans either appreciate or resent.

The trilogy is one of the cornerstone YA dystopian series of the early 2010s, alongside Hunger Games and Divergent. If you read Delirium and want to know what happens next, this delivers on the promise. New readers should start with book one.