Flitter loves her twin sister, Cloudchaser, more than anything in the world. The two were inseparable for as long as they could remember, helping each other through times of trouble and cherishing their joyous moments together—one half that completes the other.

But Flitter had never imagined losing Cloudchaser forever. Without her sister, she feels that everything had suddenly become darker, more hollow, as though something inside her had died as well. Though it is difficult, she must find the strength and will to somehow push past the grief and emptiness and carry on in a life without her other half...