Rain Roche was just trying to survive high school. Then the world started ending. An asteroid the size of Texas is on a collision course with Earth, and panic is spreading faster than the news. Towns unravel. People turn feral. Rain watches helplessly as her quiet coastal life collapses in real time. But the asteroid isn't the only disaster headed her way. When Rain discovers she may be descended from aliens, everything she thought she knew about herself shatters. Her family. Her past. Her future. With time running out, Rain teams up with her neighbor Ang, an unexpected ally, to uncover the truth about her origins and whether that truth can save her or doom her along with the rest of humanity. As the countdown ticks closer to zero, one question matters more than any other: If you were never meant to belong on Earth... would you still try to save it? Tick. Tock. Tick.