This is not really a sequel, but a stand-alone book covering the same worldwide events from a different point of view than the white, suburban family in Life as We Knew It. This one involves three working-class Puerto Rican teen siblings in Manhattan, whose parents disappear on the first day of the disaster. This change introduces both a grittier level of grimness (the first book didn't have rat-eaten bodies rotting in the streets or stadiums full of naked corpses) and some new issues, such as class differences, and the place of faith and the church community in the face of overwhelming disaster.
Like the first book, though, big, discussion-worthy themes of response to climate change, the collapse of the energy infrastructure, and the role of the individual within the community are carried by a taut, suspenseful, and realistic story of individual and family survival. This, of course, makes it ideal for middle and high school discussion groups. Profoundly disturbing, the book will make many readers want to put it down -- but the relentless story won't let them.