On the last day of classes, Cassandra Devlin leaves her exams straight into the forest. But the trees here are somehow irregular and the animals are unknown to science, and in general it’s good if you manage to survive. The discovered ruins of buildings only confuse even more. Where have the people gone? What kind of toxic fog emanates from the ruins in the moonlight? And why does Cassandra feel like she's being watched? Tormented by fear, Cassandra is overjoyed by the appearance of the impressive setari. Having landed in a world as technologically advanced as the forest was primitive, where nanocomputers grow right inside human heads and few people want to stick their heads outside the huge white-stone cities, Cass finds herself a vagabond - a refugee transported by a portal between worlds. Battling an unfamiliar language and culture, she must adapt to virtual classes, friends who can teleport, and the stereotype that vagabonds are backward and slow. Can she find her way home? And will the people of this world let Cass go when they discover her true value?