In the humorous and sarcastic story "Crime and Punishment" R K Narayan presents a smart boy who is unwilling to study.  His parents are keen on getting him a double promotion to the first form.  But the boy gives a wrong answer to the teacher's question on purpose. 

Losing his patience the teacher slaps the boy on his cheek.  The boy starts crying and threatens the teacher that he would tell his parents about the punishment.  The parents were against any sort of punishment.  They wanted him to follow the theories of child psychology and treated the boy as if he was made of thin glass.

For the thirty rupees he was receiving for teaching the boy, the teacher had to put up with their ideas.  But the boy takes advantage of the situation and makes the teacher stop the lesson and play with him.  He has to play the role of a station master with a toy train.  When the toy stops functioning the boy asks him to repair it. When he expresses his inability to do it, the boy runs to the parents to tell them about the punishment.  

The teacher has to run after the boy.  But when they meet the parents they ask the teacher about the boy's progress in his studies.  The boy pleads with him not to betray him.  The teacher tells them that he is doing well.  He adds that as they had finished their lessons early, he was playing about with the child to keep up his spirits.

Usually teachers punish students for their crimes.  Here the punishment given by the teacher becomes a crime.  The teacher is then punished for his crime by the boy.  So there is a role reversal here.  The story also presents a sarcastic picture of our education system and educational principles that we follow.