Skylar Cruz's heart is shattered. But even though everyone has betrayed her, Skylar was able to negotiate a way to open the door between the Real World and the App World. Now Skylar must help the people who left the virtual world behind as they become refugees in the Real World.And for everyone who remained plugged in, a new danger has become evident. Their bodies are mysteriously dying, and it's because of events Skylar's sister, Jude, set in motion. A virus has been unleashed that could mean total extinction of the App World - and everyone in it.Skylar and Jude must set aside their differences and work together if they are to defeat the mind virus before the App World fades away into oblivion.