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The Incredulity of Father Brown pocket we found one of those warning messages dated the day before and stamped with the flying dagger."

"I am sure," he went on gravely, "that the symbol of the winged dagger is not merely arbitrary or accidental. Nothing about that abominable man is accidental. He is all design; though it is indeed a most dark and intricate design. His mind is woven not only out of elaborate schemes but out of all sorts of secret languages and signs, and dumb signals and wordless pictures which are the names of nameless things. He is the worst sort of man that the world knows: he is the wicked mystic. Now, I don't pretend to penetrate all that is conveyed by this symbol; but it seems surely that it must have a relation to all that was most remarkable, or even incredible, in his movements as he had hovered round my unfortunate family. Is there no connexion between the idea of a winged weapon and the mystery by which Philip was struck dead on his own lawn without the lightest touch of any footprint having disturbed the dust or grass? Is there no connexion between the plumed poignard flying like a feathered arrow and that figure which hung on the far top of the toppling chimney, clad in a cloak for pinions?"

"You mean," said Father Brown thoughtfully, "that he is in a perpetual state of levitation."

"Simon Magus did it," replied Aylmer,