Murder on the Orient Express ending explained (spoilers)

[JimmyAduro]

They all did it. All twelve people had a special relationship with the murdered child and acted as they felt the jury in the man's trial should have, finding him guilty of the murder of the little girl. They arranged the murder so that they all stabbed the body of the criminal at different times in the night so nobody would know who was technically the guilty one. Poirot then decides to present a false scenario to the officials, and the people on the train are allowed to leave.