"The king sent me to get you," Merlin said, with a tone that implied strongly that he wasn't rolling his eyes where Arthur could see, but just wait until his back was turned. "He said you're to get changed into formal clothes and meet him in the Great Hall, there's a delegation coming from the Summer Court."

A fourth episode, beginning where the third ended. In which Sherlock and John play the cards dealt to them; featuring running, puzzles, running, a card game analogy, and more running.