Norman comes into the cabin and "discovers" Marion's dead body and, convinced that his mother had committed the crime, wraps the body in the shower curtain, and cleans up the bathroom.
Norman comes into the cabin. Norman "discovers". His mother had committed the crime. His mother wraps the body in the shower curtain. His mother cleans up the bathroom. His mother had committed the crime. Norman convinced this. Norman wraps the body in the shower curtain. Norman cleans up the bathroom.