Eric, a twelve-year-old human boy gets transformed into a merchild by Farallon, a merchild himself. In order to prevent Eric from being missed in his human world, Farallon’s magic shells create a twin in Eric’s Image.
Farallon inserts his own consciousness into the twin Eric so he can experience what the human world is like.
Unfortunately, neither twin knows how things work in the different worlds. Not surprisingly, that causes more problems than either of them can handle.
Read first two chapters here (.pdf)