Echo's world has been chaotic her whole life, mostly without her even knowing. Stolen from her parents as a baby, all she's ever known is Earth. But when a stranger claiming to be her twin shows up to whisk her away to the place she's never known to be home, things are about to become a lot more complicated. Especially since her new family call themselves Light Angels, and Echo is anything but bubbly, eccentric, and full of the life she sees in them. The other half of the kingdom, home of the Dark Angels, calls out to her, as one question becomes more and more uncertain: where does she truly belong?