Calm analysis of Ingerman’s nebulous threats had revealed a hostile force not to be despised. Possibly, the man was already in league with that narrow-minded village constable, so every passing hour made more urgent the need of a trained intelligence being brought to bear on the mystery of Adelaide Melhuish’s killing. Grant racked his brains to discover who could possibly have a motive for committing the crime. Naturally, his thoughts flew to Ingerman. Surely that sinister-looking person should be forced to give an account of himself instead of, as was probable, being allowed to instill further nonsense into the suspicious mind of P. C. Robinson. There were two morning deliveries of London letters in Steynholme, one at eight and another at half past ten. Grant waited until the postman had left a publisher’s circular (the only letter for _The Hollies_ by the second mail). Then, in a fever of impatience, he jammed on a hat and went out. He would wait no longer. He would telegraph Scotland Yard again, and, incidentally, demand an audience at the post office. No sooner had he entered the highroad than he saw P. C. Robinson on guard. That important person was standing on the bridge, apparently taking the air. He was nibbling the chin-strap of his helmet; both thumbs were locked in his belt. From that strategic position three roads came under observation. It was a fine morning, and Grant’s sense of humor was not proof against this open espionage. He smiled, and determined to take a rise out of “Sherlock,” as Bates had christened the policeman. The bridge lay a hundred yards to the left. The road was straight until it curved around the house and its shrubberies, so the view was blocked on that side. Grant filled and lighted a pipe with a deliberateness meant to be provoking, glancing several times doubtfully at P. C. Robinson, who, of course, was grandly unaware of his presence. Then he strolled off to the right, and, when hidden, took to his heels for a hundred yards sprint. Turning into a winding bridle-path tucked between hedges of thorn and hazels, he walked to a point where it crossed a patch of furze. At a little distance a hand-bridge spanned the river, and gave access to the eastern end of the village by a steep climb of the wooded cliff. The path, in fact, was a short cut to that part of Steynholme. He sat on a hump of rock, and waited. It was a boyish trick, but very successful. Within three minutes, at the utmost, P. C. Robinson hurried past, using a stalking, stealthy stride which was distinctly ludicrous. The eyes of the two men met, but Grant alone was prepared. “Hello, Robinson!” he cried cheerfully. “What’s the rush? Surely our rural peace has not been disturbed again?” Robinson knew he had been “sold,” but rose to the occasion. “Excuse me, Mr. Grant,” he puffed. “Can’t wait now. Have an appointment. I’ll see you later.”