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 saw its practical possibilities; and the terrible plot was formulated. She created this horror, and then, with her diseased imagination, she came to believe in it. Her plausible stories to us, her superb acting, her clever deceptions—all were part of this horrible fantasy she had engendered. That book of Grimm's 'Fairy-Tales'!—I should have understood. Y' see, it wasn't histrionism altogether on her part; it was a kind of demoniac possession. She lived her dream. Many young girls are like that under the stress of ambition and hatred. Constance Kent completely deceived the whole of Scotland Yard into believing in her innocence."

Vance smoked a moment thoughtfully.

"It's curious how we instinctively close our eyes to the truth when history is filled with substantiating examples of the very thing we are contemplating. The annals of crime contain numerous instances of girls in Ada's position who have been guilty of atrocious crimes. Besides the famous case of Constance Kent, there were, for example, Marie Boyer, and Madeleine Smith, and Grete Beyer. I wonder if we'd have suspected them"

"Keep to the present, Vance," interposed Markham impatiently. "You say Ada took all her ideas from Gross. But Gross's handbook is written in German. How did you know she spoke German well enough?"

"That Sunday when I went to the house with Van