Bailey emerged from the fireplace with a handful of sooty flakes.
"Is this all right?"
"Yes. Now rub it on the handle of that bag." She indicated the little black bag in which Doctor Wells carried the usual paraphernalia of a country Doctor.
A private suspicion grew in Bailey's mind as to whether Miss Cornelia's fine but eccentric brain had not suffered too sorely under the shocks of the night. But he did not dare disobey. He blackened the handle of the Doctor's bag with painstaking thoroughness and awaited further instructions.
"Somebody's coming!" Dale whispered, warning from her post by the door.
Bailey quickly went to the fireplace and resumed his pretended labors with the fire. Miss Cornelia moved away from the Doctor's bag and spoke for the benefit of whoever might be coming.
"We all need sleep," she began, as if ending a conversation with Dale, "and I think——"
The door opened, admitting Billy.
"Doctor just go upstairs," he said, and went out again leaving the door open.
A flash passed across Miss Cornelia's face. 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. But we are well protected now. And besides, why should this person remain in the house? The murder is done, the police are here."
"True," he said. "I only thought——"
But a knocking at the terrace door interrupted him. While the attention of the others was turned in that direction Dale, less cynical than her aunt, made a small plea to him and realized before she had finished with it that the Doctor too had his price.
"Doctor—did you get it?" she repeated, drawing the Doctor aside.
The Doctor gave her a look of apparent bewilderment.
"My dear child," he said softly, "are you sure that you put it there?"
Dale felt as if she had received a blow in the face.
"Why, yes—I—" she began in tones of utter dismay. Then she stopped. The Doctor's seeming bewilderment was too pat—too plausible. Of course she was sure—and, though possible, it seemed extremely unlikely that anyone else could have discovered the hiding-place of the blue-print in the few moments that had elapsed between the time when Billy took the tray from the room and the time when the Doctor ostensibly went to find it. A cold wave of distrust swept over her—she turned away from the Doctor silently.
Meanwhile Anderson had entered, slamming the terrace-door behind him.
"I couldn't find anybody!" he said in an irritated voice. "I think that Jap's crazy."
The Doctor began to struggle into his topcoat, avoiding any look at Dale.
"Well," he said, "I believe I've fulfilled all the legal requirements—I think I must be going." He turned toward the door but the detective halted him.
"Doctor," he said, "did you ever hear Courtleigh Fleming mention a Hidden Room in this house?"
If the Doctor started, the movement passed apparently unnoted by Anderson. And his reply was coolly made.
"No—and I knew him rather well."
"You don't think then," persisted the detective, "that such a room and the money in it could be the motive for this crime?"
The Doctor's voice grew a little curt.
"I don't believe Courtleigh Fleming robbed his own bank, if that's what you mean," he said with nicely calculated emphasis, real or feigned. He crossed over to get his bag and spoke to Miss Cornelia.
"Well, Miss Van Gorder," he said, picking up the bag by its blackened handle, "I can't wish you a comfortable night but I can wish you a quiet one."
Miss Cornelia watched him silently. As he turned to go, she spoke.
"We're all of us a little upset, naturally," she confessed. "Perhaps you could write a prescription—a sleeping-powder or a bromide of some sort."
"Why, certainly," agreed the Doctor at once. He turned back. Miss Cornelia seemed pleased.
"I hoped you would," she said with a little tremble in her voice such as might easily occur in the voice of a nervous old lady. "Oh, yes, here's paper and a pencil," as the Doctor fumbled in a pocket.
The Doctor took the sheet of paper she proffered and, using the side of his bag as a pad, began to write out the prescription.
"I don't generally advise these drugs," he said, looking up for a moment. "Still——"
He paused. "What time is it?"
Miss Cornelia glanced at the clock. "Half-past eleven."
"Then I'd better bring you the powders myself," decided the Doctor. "The pharmacy closes at eleven. I shall have to make them up myself."
"That seems a lot of trouble."
"Nothing is any trouble if I can be helpful," he assured her, smilingly. And Miss Cornelia also smiled, took the piece of paper from his hand, glanced at it once, as if out of idle curiosity about the unfinished prescription, and then laid it down on the table with a careless little gesture. Dale gave her aunt a glance of dumb entreaty. Miss Cornelia read her wish for another moment alone with the Doctor.
"Dale will let you out, Doctor," said she, giving the girl the key to the front door.
The Doctor approved her watchfulness.
"That's right," he said smilingly. "Keep things locked up. Discretion is the better part of valor!"
But Miss Cornelia failed to agree with him.
"I've been discreet for sixty-five years," she said with a sniff, "and sometimes I think it was a mistake!"
The Doctor laughed easily and followed Dale out of the room, with a nod of farewell to the others in passing. The detective, seeking for some object upon whom to vent the growing irritation which seemed to possess him, made Bailey the scapegoat of his wrath.
"I guess we can do without you for the present!" he said, with an angry frown at the latter. Bailey flushed, then remembered himself, and left the room submissively, with the air of a well-trained servant accepting an unmerited rebuke. The detective turned at once to Miss Cornelia.
"Now I want a few words with you!"
"Which means that you mean to do all the talking!" said Miss Cornelia acidly. "Very well! But first I want to show you something. Will you come here, please, Mr. Anderson?"
She started for the alcove.
"I've examined that staircase," said the detective.
"Not with me!" insisted Miss Cornelia. "I have something to show you."
He followed her unwillingly up the stairs, his whole manner seeming to betray a complete lack of confidence in the theories of all amateur sleuths in general and spinster detectives of sixty-five in particular. Their footsteps died away up the alcove stairs. The living-room was left vacant for an instant.
Vacant? Only in seeming. The moment that Miss Cornelia and the detective had passed up the stairs, the crouching, mysterious Unknown, behind the settee, began to move. The French window-door opened—a stealthy figure passed through it silently