I think my biggest issue with DELIRIUM was probably the pacing of the overall story. Even as I reread the story before beginning PANDEMONIUM, I was ultimately overcome with the sense that things were really dragging, since the author was forced to devote most of the story to the world building for a universe that views love as the most dangerous of all diseases. While reading the first book of the series, I found myself constantly wanting more background information to describe to me how our current world could have morphed so quickly into Oliver's dystopian reality, but I'm really not disappointed that PANDEMONIUM seemed to take things in an entirely new direction. 
 Book two of the series was definitely more action packed than the first installment, constantly alternating between flashbacks of Lena's initial struggle to adapt to life as a refugee in the Wild to sections that depicted the current day scenario, where Lena has been assigned to assimilate herself into mainstream society in order to keep an eye on Julian, a persuasive activist who seeks his life's mission in the fight to have every individual in society undergo the surgery that ultimately removes the ability for a person to feel love. 
 I definitely think that PANDEMONIUM was more focused than the first novel on the development of the plotline, more so than on the descriptions of the society's belief system. The key issue in this novel is survival -- survival as Lena adapts to a new, unfamiliar world in the Wild and survival as Lena attempts to assimilate herself into mainstream society again with a new project at hand ... to keep an eye on Julian, the head of a Cured activist group that starkly endorses everything that Lena believes is wrong with the universe. 
 The story alternates between two perspectives in alternating chapters -- "THEN," which depicts the days immediately following DELIRIUM, and "NOW," which details the current movement of the resistance. The format of the story definitely keeps the pace alive, ensuring that the reader discovers the story bits at a time from each section. 
 I wasn't entirely thrilled with the prospect of another love interest, although the story of Julian and Lena felt less "insta-love" than that of Lena and Alex in the first book. And, although I think the final plot twist was pretty predictable, it was still enjoyable and culminated in a fantastic cliff hanger that will leave the reader begging for more. 
 But, not so fast. We have a wait for the next novel, of course.