"Who has done this?" she asked, pointing downwards.
"It may have been an accident," Arnold suggested.
"An accident!" she repeated. "What was he doing in my sitting-room? Besides, he could not have crept underneath the couch of his own accord."
"Do you know who it is?" Arnold asked.
"Why should I know?" she demanded.
He hesitated.
"You remember the night of my first visit here—the face at the window?"
She nodded. He pointed downward to the outstretched hand.
"That is the man," he declared. "He is wearing the same ring—the red signet ring. I saw it upon his hand the night you and I were in this room alone together, and he was watching the house. I saw it again through the window of the swing-doors on the hand of the man who killed Rosario. What does it mean, Fenella?"
"I do not know," she faltered.