Where is Home?

Kitty and her twin sister, Opal, have lived in the woods their entire life. They were abandoned there when the were just old enough to read, write, and remember their names. When out exploring, Opal is found by a middle-aged woman, and is taken to a horrible orphanage with dangerous secrets. Now, it's up to Kitty and a mysterious man with a blue box to save Opal. But as I said before, the orphanage has dark secrets, secrets that some people would kill to find out about, and Opal just might be too curious for her own good...