When a terrifying intruder attacks her underground sanctuary, 16-year-old Eva is forced to leave behind her home and her robot caretaker, Muthr. Armed only with her survival skills and a cryptic note labeled WONDLA, she begins a search for other humans in an unfamiliar world.

Having survived the attack on her sanctuary, Eva finds herself on a strange planet called Orbona. She meets a telepathic waterbear named Otto and a surly alien named Rovender who has a promising connection to humans.

Rovender guides Eva and Muthr to the fishing village of Lacus to meet a duplicitous merchant of human antiques. To get the information they need, Eva must make a risky bet at the Spiderfish Races.

Eva tracks down the Arsian sage, Darius, who reveals a devastating account of humanity's last days. Eva doubles down on her quest to find other humans as the alien bounty hunter Besteel closes in.

Besteel delivers Eva to the capital city of Solas, where she finds an unlikely ally in the timid teenage Queen of Orbona.

With a human civilization in sight, Eva leads a risky mission across the most perilous obstacle yet.

Eva learns the truth about humankind. Meanwhile, Besteel tracks Eva down for a final showdown.