What Does C.S. Lewis Account for the Evil in the World?

Lewis refuses to believe in dualism. He wants us to see a good creation which goes wrong and needs to be redeemed, restored, put back on track. Lewis is trying to make the point that there is something wrong with this world that we can recognize but we cannot fix it by ourselves. We aren't if you like a good observer of an unjust world, we are part of the world we're observing and we're caught up in if you like it having gone wrong.