Read the story and answer the questions to test your comprehension.
There is a rat infestation in the town of Hamelin, Germany. A magical man comes to lure the rats away with his pipe playing. He drowns them in the river and, when he returns, the people of the town are greedy and will not pay him. He takes his revenge and lures away the children next. This story is where we get the expression that we must "pay the piper."