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 method, every device, every detail, from its pages—from actual criminal history! We are hardly to be blamed for our inability to combat her schemes; for it was not she alone who was deceiving us; it was the accumulated experience of hundreds of shrewd criminals before her, plus the analytic science of the world's greatest criminologist—Doctor Hans Gross."

He paused to light another cigarette.

"But even when I had found the explanation of her crimes," he continued, "I felt that there was something lacking, some fundamental penchant—the thing that made this orgy of horror possible and gave viability, so to speak, to her operations. We knew nothing of Ada's early life or of her progenitors and inherited instincts; and without that knowledge the crimes, despite their clear logic, were incredible. Consequently, my next step was to verify Ada's psychological and environmental sources. I had had a suspicion from the first that she was Frau Mannheim's daughter. But even when I verified this fact I couldn't see its bearing on the case. It was obvious, from our interview with Frau Mannheim, that Tobias and her husband had been in shady deals together in the old days; and she later admitted to me that her husband had died thirteen years ago, in October, at New Orleans after a year's illness in a hospital. She also said, as you may recall, that she had seen Tobias a year prior to her husband's death. This would have been fourteen years ago—just the time Ada was adopted by Tobias. I thought there might be some connection be-