“Jackson, sir. The cricketer.”

“Never mind about his cricket, Smith,” said Mr. Downing with irritation.

“No, sir.”

“He is the only other occupant of the room?”

“Yes, sir.”

“Nobody else comes into it?”

“If they do, they go out extremely quickly, sir.”

“Ah! Thank you, Smith.”

“Not at all, sir.”

Mr. Downing pondered. Jackson! The boy bore him a grudge. The boy was precisely the sort of boy to revenge himself by painting the dog Sammy. And, gadzooks! The boy whom he had pursued last night had been just about Jackson’s size and build!