Sixteen-year-old Frost understands why she's spent her entire life in an abandoned apartment building. The ruined streets below are hunting grounds for rogue robots and Eaters. She understands why she's never met a human besides her father. She even understands why he forbids her to look for medicine for her dying pet. But the thing is, it's not her real father giving the orders . . . It's his memories. Before he died, Frost's father uploaded his consciousness into their robot servant. But the technology malfunctioned, and now her father fades in and out. So when Frost learns that there might be medicine on the other side of the ravaged city, she embarks on a dangerous journey to save the only living creature she loves. With only a robot as a companion, Frost must face terrors of all sorts, from outrunning the vicious Eaters . . . to talking to the first boy she's ever set eyes on. But can a girl who's only seen the world through books and dusty windows survive on her own?