Book 4: Read the entire series before The RK's are reeling their support and accomplishments from the past two years that have passed, but there's no time to stop. Survival in the Ruins requires movement, and so, with strong hearts, RK's continue their quest to find the jet they saw in the skies two years ago. If that jet exists, then humanity itself must have survived... somewhere. Finding it is their best hope for having a future and a life worth living. But the Ruins is far more dangerous than any of them can imagine. The Infected seem to be mutating in terrifying ways that could change everything the RK's know about surviving among the walking dead. And even worse, a death cult has arisen that is gathering new followers at a frightening rate and is devoted to sending every living person in the Ruins into the waiting arms of death.