A boy and girl walk into a theatre and proceed to act out the whole of Grimm's King Grisly-Beard for the reader. And they are indubitably good.
When a princess refuses to marry any of the princes her father has lined up, he marries her to a poor musician who takes her to his hovel home and makes her work for her keep. But this poor musician seems to know a bit too much about the infamous King Grisly-Beard... and he keeps his face covered a lot of the time.