The pupils of St Hope's are horrified when a new Slang Prevention system forces them all to speak politely. When someone attempts to sabotage the system by overloading it with power, the spies must save the school from exploding.

When the spies discover the existence of a SKUL school, they send Oscar on an undercover mission. However, as he wins the admiration of his teachers, he is tempted to join SKUL for real.