The houses in Hamelin were full of rats. A strange man arrived, promising to rid the town of them. The townspeople agreed to pay him, but when the job was done, they refused. The Piper, angry, played his pipe, and the children of Hamelin followed him away, never to return. The townspeople carried out their promise in regret.
Note: The verbs 'played', 'asked', 'refused', 'followed', 'carried' were used to construct the summary.