A tragedy leaves Jamie and Sophie Bennett without a home or a family, and to save them from being separated in the foster care system, the Guardians take the children under their wing.

The moon is my earliest memory. But that's all I can remember. And when I try to remember more, a wall comes up. Like my mind doesn't want me to remember what happened before the moon. My name is Helen. Helen Bennett. Where do I come from? I don't know. I was found on a doorstep when I was still only a baby. No one knows where I came from. And I don't think anyone ever will.