The Mysterious Birthday Cake

At a time when the Crown's salon was empty and everyone else was either upstairs or in another room, Sir Arthur arrived in the hall. Under his arm was a large white cardboard box, which thankfully he had been able to protect from the rain by his cloak. He wiped his boots on the mat, though he did not bother to remove his cloak or hat - he was not staying, after all.

Quietly he made his way to the salon, which to his relief he found was empty