“A sort of chameleon boot,” murmured Psmith.
The goaded housemaster turned on him.
“What did you say, Smith?”
“Did I speak, sir?” said Psmith, with the start of one coming suddenly out of a trance.
Mr. Downing looked searchingly at him.
“You had better be careful, Smith.”
“Yes, sir.”
“I strongly suspect you of having something to do with this.”
“Really, Mr. Downing,” said the headmaster, “that is surely improbable. Smith could scarcely have cleaned the boot on his way to my house. On one occasion I inadvertently spilt some paint on a shoe of my own. I can assure you that it does not brush off. It needs a very systematic cleaning before all traces are removed.”
“Exactly, sir,” said Psmith. “My theory, if I may——?”