When you are an orphan, changing houses is a common thing. But April had never been in something like this before. Winterbourne House is the most amazing orphanage in the world! This is a whole old estate, and only a couple of children live there. And it seems that they all got here for a reason. April, for example, accidentally burned down an exhibition dedicated to the Winterbourne family... And she also has a key. This key was left to her by her mother before she disappeared without a trace many years ago. And here's what's incredible: on this key is the Winterbourne coat of arms! And now the girl will stop at nothing to solve this riddle. After all, then, perhaps (just perhaps), she will finally be able to find her mother...