Walt Kelly, but this one does not involve Pogo!
I have to apologize for the quality of the presentation in advance. I difficulty cramming the book in the scanner, so I resorted to photographing it.
The story is basically a retelling of the Pied Piper story. But instead of rats...
Now, you can't have a town full of monsters. You need someone to get rid of them.
This is a very nice Piper. Instead of money, he asks the mayor to keep the town cheery and nice. That's easier said than done. People start gossiping, arguing over things such as what the Piper looked like (nobody can quite remember. Unlike the readers, they can't flip back the pages). There begins to be a lot of unease, and children get disciplined for no reason. The adults are drawn in a very strange fashion as the story goes on.
The Piper doesn't like this.
The Piper saves the day by taking the children off, presumably to a happier place.