Fever is the second book in the Chemical Garden trilogy. Set in a future world where girls die in their early twenties and boys just a few years later, Rhine and Gabriel escape from the Mansion only to enter a world far more threatening than they had imagined. Escaping into a devastated world that has been left to die and crumble into ruin, they seek Rhine's twin and supposed safety in Manhattan taking Lilac's malformed and silent daughter with them. But can Rhine truly escape the evil Vaughn?