The secret of the house on the street Morg

Why was I even drawn to investigate crimes? Here you have to start from afar. My mother’s mother died, and we and my younger sister and the terrible brother were scattered through the foster families. The family who sheltered his brother lives very far, but the foster family of sister - after a few streets. So of my family people I have only a sister, so I could not resist her prayers. The fact is that her girlfriends were accused of a monstrous murder! Of course, I should not prove anything that the police were mistaken, and this man is innocent. But Auguste Dupin, a famous police inspector, challenged me - if I am such a smart boy, then I can find a real killer?
For secondary school age