This continues the exploration into the mysterious flu that turns its victims into the Undead that we were so superbly introduced to in the first book ([book:Flu|7504472]), but this time we follow a few different stories at different times across the five sections that make up this book. We start in a secret underground lab at the start of the outbreak discovering the origins of the virus that were kept a mystery in the first book. From there we follow soldiers, conspiracy theorists and civilians as they try and understand then survive events as the virus spreads and society crumbles. Add into this the usual distrust of authorities that dominates life in Northern Ireland, this makes for some dramatic and tense moments that shows that the virus isn't the only deadly thing on the streets. Some of the niggling contradictions are still there about the nature of the zombies/undead but the characters and the story itself more than make up for this. Pleasingly (and somewhat annoyingly) this has also been left open ended ready for another in the series (for which I'm going to have to wait it seems) so there will be more to this rather addictive series.