Clover Martinez and the Last Teenagers on Earth are busy exploring the galaxy after leaving earth behind...even if they are homesick. So when their ship receives a distress signal from their former home, they hope against hope that it means that there are other survivors. But as soon as they arrive, they realize something's deeply wrong: strange crystal formations are taking over Earth's soil and threatening to destroy the planet.

Seeking the origin of the formations, the group discovers a colony of survivors hidden in the mountains. Relief gives way to panic as the teenagers realize these survivors aren't who they seem…and Clover and her friends might not be able to escape.