Harry Potter

*Harry walks along in his room at the Dursleys. Summer break is almost over. He decides to go into the basement. There were lots of weird things down there, but something catches his eye. Its a note. It says "Dear Sirius Black, I can't find the other child. I found Harry, but I cant find the other child. I looked everywhere in that house. I fear Voldemort might have taken the poor child. As Harry grows older, we mustn't tell him about his younger sibling. I hope you well."* A younger sibling...?