officers working in the provinces and this will make a third.â
âStill, we canât refuse. Have we any senior officer with local knowledge?â
The Superintendent considered. âNo, sir, but among the juniors there is Sergeant Jago, who was born at Tavistock and passed his early days there. The only chief inspector that could be spared at the moment is Richardson. Heâs the junior chief inspector, but heâs had a varied experience and either by good luck or good management he has got home with his cases.â
âCould he start at once?â
âYes, sir, this afternoon if you like.â
âSend him in, then.â
In a few moments the junior chief inspector made his appearance. There were those who resented his quick promotion over the heads of officers senior to him, but it was impossible to feel malice towards a man who gave himself no airs, who appeared ever anxious to learn from those junior to himself in rank, and who gave the fullest credit to all who worked under him. It had been his success in a Paris case and the warm recommendation from the Foreign Office that had brought him his last step in promotion.
âYou sent for me, sir?â he said to Morden.
âYes, Mr. Richardson. It was to ask you if you know Dartmoor at all?â
âNo, sir. Iâve been once to the convict prison, but that is all.â
âWell, now is your opportunity. The Chief Constable has asked for help in a difficult case which is set out in these papers, and I propose that you take Sergeant Jago with you, as he has an intimate knowledge of the district. Get a copy made of these papers to take with you; get the anonymous letters photographed; get the usual advances and report yourself to the Superintendent at Winterton to-night if you can.â
 âVery good, sir.â
âI donât want you to waste valuable time in writing reports, but if you make any discovery that promises well, you should let us know.â
For the next hour Richardson made life a burden to the various departments concerned in sending officers to work in the provinces. But in the end he found himself on the Waterloo platform with his companion in time for the afternoon express to Tavistock. All this had been arranged by telephone from Scotland Yard. The first part of the journey was devoted to a study of the Chief Constableâs letter, and to the photographs of the two anonymous letters.
âHave a good look at these photographs, Jago, and tell me what you make of them,â said Richardson; âtake your time.â
Jago studied the envelopes and their postmarks and then scrutinized the text of the letters. âOne thing strikes me, Chief Inspector. These two letters were sent off on the same day and the man who posted them could only have posted one in Tavistock and the other in Moorstead if he had a car or motor-lorry.â
âAh! Thatâs where your local knowledge comes in. Itâs a sound deduction, but why should the owner of the car go to such pains to be anonymous?â
Sergeant Jago shook his head, and Richardson pulled out a map from his pocket. âThe distance is only a dozen miles or so, nothing very much for a motor-lorry; but what do motor-lorries carry right across the moor?â
âMostly granite.â
 âOh, then there are granite lorries between Tavistock and Moorstead?â
âYes, sir, thereâs Roweâs quarry a mile or two out from Tavistock, where the best granite comes from, and thereâs a smaller quarry somewhere near Moorstead.â
âHave you noticed anything special about the handwriting of these anonymous letters? Would you say that the two were written by the same man?â
Jago studied the photographs again. âWell, if they were, the fellow disguised his hand. The writing in the Commissionerâs letter slopes backward much more than the other.â
âIt does, but thatâs a familiar trick
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