When millions of people begin to disappear, Gabby, her sister, and their other companions will have to stick together for survival and to figure out what happened behind an indescribable occurrence.

When a billion people around the globe suddenly vanish and chaos engulfs the nation -- headstrong 15-year-old Gabby is thrust into adulthood way too soon. The event forces Gabby, along with her younger sister Claire and the two teen boys vying for Gabby's affection, Josh and Flynn - to try to figure out what has happened and how they fit into this dangerous new world.—james barnes