Rosi and her young brother Bobo have lived their entire lives in a community of adults they call "Freds". The Freds are nurturing and have taught the children rules for getting along and forming a society but they have been very clear in stating they are not the children's parents. Now, suddenly, all the children are being returned to their biological parents without any explanation. This ought to be good news but when the children return to their hometown, things are strange. People avoid Rosi and it's clear that people with her eye color are ostracized. Even her parents don't seem to like her but they dote on Bobo. Some big secret is being kept from the children about their town and why they were with the Freds in the first place.
Just, ugh. The secret is not great and it took way too long to get to the reveal. And the time it took to get there was not compelling at all. On top of that, after treating Rosi like shit the entire time she lived with them, it turns out there as a very good reason for treating her like shit and now we're supposed to understand and sympathize with the parents. Nope.