A ten-year-old girl wakes up in a strange place with blood on her hands, and no memory of how it got there. She finds herself in a huge city which she has never seen before, and she must depend on others to survive. All Mem wants to do is just try to find her way home, but that becomes a bit difficult when she is being chased by police.
When it comes down to it, Mem may or may not be human. After all, humans don't just kill people and forget.