"What is it?"
"Use the Prior's Vent."
They both looked at me as if I had gone mad. Even Watkins regarded me with stern disapproval.
"What are you talking about?" demanded Nikka.
"This is serious," reproved Hugh. "Just because you find a silly cipher—"
"I am serious," I insisted. "This has been an eventful evening. Among other things, I think I have found the Prior's Vent."
Hugh shook his head sadly.
"There's been too much talk of secrets," he said. "Watty, go and ring up Dr. North. He must have hurt his head in that mix-up."