The most dominant theme in this story is the relationship between those in power and those subjugated to power. Nicholas's aunt makes the rules and enforces the punishment. This story makes it clear that having authority and power does not make a person worthy of that power.
The main idea of “The Lumber Room” by Saki are generational gaps and the consequences of a tyrannical way of raising children. Through these themes, the author criticises his aunts who raised him in a strict and traditional environment, but he also brings a critique to the strict Edwardian society in which he lived.