Have you seen my brother Noah?

Imagine your life without graduating from school successfully and not going to college, because you are the only hope for your brother to survive. You have no idea of where your mother is and your dad doesn't care about you. Not really a life you would choose?
Abby lives with her little brother Noah and tries her best to be a good sister and parent to him. Her life revolves around him. Without Noah she would probably go mad. But one day Noah disappears. And every person she asks about him tells her that they never knew a boy named "Noah Maples". What happened to Noah? Is it someone's evil joke or some conspiracy? Abby is determined to discover that, especially when she meets a boy who looks exactly like Noah but certainly is not him.