For official rules i.e. the fine print please see this post.
Which story had excerpts from the PETROKOV FAMILY ARCHIVES? An excerpt of one is included below.
It’s Christmas Eve, but the world is strangly hushed. Normally, the changelings would be playing their yearly tricks – I always half expect to find a tiger sitting on my porch come midnight, as I did once when I was a child. He’s brought me a fresh bough of holly, can you imagine?