Dora deliberately produced the pearl brooch from her pocket, and held it out towards the other.
"Perhaps this will refresh your memory?" she said slowly.
"My brooch!" said Lady Burville in surprise. "How did you come by it? How did you find it?"
"I did not find it, but Dr. Scott did."
"Really! Where?"
"On the floor of the room in which Mr. Edermont was killed."
Lady Burville's face turned even whiter than it was before.
"I--I do not understand," she stammered, shrinking back.
"I can explain," continued Dora pitilessly. "You visited the Red House on the night of the second of August; you dropped this brooch there, and you there killed my guardian."
"No, no! I--I did not! Who dares to say such a thing?"