She stepped to the door.
She called.
"Doctor! Oh, Doctor!" "Yes ?" answered the Doctor's voice from the main staircase.

His steps clattered down the stairs--he entered the room.

Perhaps he read something in Miss Cornelia's manner that demanded an explanation of his action.

At any rate, he forestalled her, just as she was about to question him.
"I was about to look around above," he said.

"I don't like to leave if there is the possibility of some assassin still hidden in the house." "That is very considerate of you.