knew! That's the answer to the whole problem. It may not have been the murderer; but the person who sat in that library night after night and read strange books by candlelight is the key to everything. . . ."
"But Ada was so positive in her identification," objected Markham, in a bewildered tone.
"She's hardly to be blamed in the circumstances," Vance returned. "The child had been through a frightful experience and was scarcely normal. And it is not at all unlikely that she, too, suspected her mother. If she did, what would have been more natural than for her to imagine that this shadowy figure she saw in the hall long after midnight was the actual object of her dread? It is not unusual for a person under the stress of fright to distort an object by the projection of a dominating mental image."
"You mean," said Heath, "that she saw somebody else, and imagined it was her mother because she was thinking so hard of the old woman?"
"It's by no means improbable."
"Still, there was that detail of the Oriental shawl," objected Markham. "Ada might easily have mistaken the person's features, but her insistence on having seen that particular shawl was fairly definite."
Vance gave a perplexed nod.
"The point is well taken. And it may prove the Ariadne's clew that will lead us out of this Cretan labyrinth. We must find out more about that shawl."
Heath had taken out his note-book and was turning the pages with scowling concentration.
