I wouldn't say they were based in myths. Fairy tales are cautionary in my world. There's one called Little Red Riding Hood about a girl who goes into the forest and strays off the path when a wolf calls to her. It's a story meant to keep children from talking to strangers when they're alone.

There was a man named Moriarty who was using fairy tales as a framing device for his crimes. He fancied himself the story-teller and Sherlock and I were characters he was writing into different roles... different corners. [John glances over toward his friend.]

Mr. Moriarty made up a lie--a fairy tale--and fed it to the people around us. It ended up destroying Sherlock's reputation. [He shrugs one shoulder.] Not something I really want to talk about, though, if that's all right. You should try to get some rest, anyway. As much as you can.