“The murderer was in the house while you were there,” he said. “There is nothing more certain than that. The murderer was Captain Marsland.”
“I can’t believe it,” she said.
“Wasn’t it he who put the idea into your head, after you had left the house, that the murderer might have been upstairs all the time?”
“Yes, it was.”
“And he told you that he had slammed the hall door when he left? You didn’t see him close it?”
“No, I was waiting for him down the path. After seeing poor Frank I felt too frightened to stay in the house.
“Marsland left the door open, but told you he had closed it, his object being to give the police the impression that it had been left open by some one who left the house after he did. But I closed it when I left—I distinctly remember doing so.”
“What makes you suspect Marsland? He had no grudge against Frank. Why should he kill him?”
“If Marsland didn’t kill him, who did?”
“Any one may have done so. A tramp, for instance, who had broken into the house and was there when Frank came home.”