The world is going to end on the 21st of September. We know because we’ve seen it. We were there.
Thirteen-year-old twins Mac and Annie awake one morning to discover that everyone in their
town—and, it seems, the entire world—has been wiped out. Searching for answers, the twins
discover they are not alone: three other sets of twins, scattered across the planet, have
survived. Given a chance to stop the mass extinction by their newfound ability to travel
backwards through time and their mysterious powers over natural elements, Mac
and Annie seek out these twins. Together they must solve the mystery of why the
human race was wiped out, and stop it happening again.
