She bit her lips until the blood came. Her face had become very pale. If the threat were meant seriously—and she could see no reason why it should not be—she was in an awkward predicament. Ordinarily she had ready resource, a fertile genius for invention. Now her wits seemed to have deserted her. Cudgel her brains as she would, she could see no way out of the difficulty. To boldly state that the jewels had been entrusted to her by Eileen would involve opening up a fresh line of inquiry for the C.I.D. men that might have disastrous results. Nor was there any person who might bear out a story invented on the spur of the moment.
"Well?" He spoke coldly.
"I refuse to tell you where I got them," she retorted. "You must do as you like."
"Then it is my duty to warn you that anything you say may be used in evidence against you. You will be charged." He opened the door and cried down the corridor, "Reserve!" To the constable who answered he indicated the Princess by a nod. "Take this woman to the detention room. She will be paraded for identification in half an hour."
The detention room of a London police station is a compromise between the comparative luxury of a waiting-room and the harshness of a cell. Like a waiting-room it is furnished with chairs and tables, and like a cell its door is provided with a strong, self-acting lock. The Princess Petrovska gritted her teeth viciously as she was left alone, and paid no heed to the magazines and papers left on the table—a consideration for visitors that had not been discernible in the waiting-room.
Meanwhile, Foyle had set every available man of the divisional detachment of the C.I.D. busily at work. A couple had been sent to verify the account given by the woman of her movements on the night when the murder occurred. The remainder had been sent to bring in a score of women, the wives and daughters of inspectors and other senior officers.
Detective-Inspector Taylor had turned up with Wills, who was informed of the part he had to play.
"You say you couldn't recognise the woman who came out of Lord Burghley's house. Now we're going to give you another try. We don't want you to pick any one out unless you're absolutely sure. Mind that."
Some of the women who had been fetched in by the