The keeper of the stall came forward as Peter lingered. He was tall, with disordered hair, neatly dressed in tweeds. He looked at Peter in a friendly way—obviously accessible.
"You are reading the inscription?" he said politely.
"What does it mean?" Peter asked.
"Have you looked at any of the books?"
"They seemed to be mixed."
"They are in one way all alike."
"How is that?"
"Explosive."
The keeper of the stall looked curiously at Peter, and began to like his ingenuous face.