Twin sisters separated from different countries both have a pen pal program in school which they both have each other to write but when the other twin needs help with a mystery to solve they end up both dealing with the mystery.
Well everyone has their secrets.
Mine is that I'm part of a gang.
I'm also not know to anyone in this gang.
Confused? I would be too.
I'll explain but you mustn't tell anyone.
It is for me to know and everyone else to find out.