Missing About ten o’clock on the morning of the tenth day after the murder of Charles Gething, Inspector French sat in his room at New Scotland Yard wondering for the thousandth time if there was no clue in the affair which he had overlooked, no line of research which he had omitted to follow up. He had seldom found himself up against so baffling a problem. Though from the nature of the case, as he told himself with exasperation, a solution should be easily reached, yet he could find nothing to go on. The clues he had obtained looked promising enough, but—they led nowhere. None of the stolen notes had reached the bank, nor had any of the diamonds come on the market; no one in whom he was interested had become suddenly rich, and all his possible suspects were able more or less satisfactor

