"Then," I said to Goldberger, "the murder must have been committed very soon after Miss Vaughan came upstairs."
"Yes," agreed Goldberger, in a low tone, "and by somebody who came in from the grounds, since she met no one in the hall and heard no one."
Miss Vaughan leaned toward him, her hands clasping and unclasping.
"Do you know who it was?" she gasped. "Have you found out who it was?"
"We suspect who it was," answered Goldberger gravely.
"Tell me," she began.
"Wait a minute, Miss Vaughan," I broke in. "Tell me, first—did you hear anyone following you across the garden?"
"Yes," she answered thoughtfully; "once or twice I fancied that someone was following us. It seemed to me I heard a step, but when I looked back I saw no one."
"Did that fact make you uneasy?"
"No," she said, with a little smile. "I thought it was Mr. Swain."