Tarling had a brief interview with his assistant Whiteside, and the Inspector, to his surprise, accepted his view of Ling Chu's confession.

"I always thought Milburgh was a pretty cool customer," Whiteside said thoughtfully. "But he has more gall than I gave him credit for. I would certainly prefer to believe your Chink than I would believe Milburgh. And, by the way, your young lady has slipped the shadow."

"What are you talking about?" asked Tarling in surprise.

"I am referring to your Miss Odette Rider--and why on earth a grown-up police officer with your experience should blush, I can't imagine."

"I'm not blushing," said Tarling. "What about her?"

"I've had two men watching her," explained Whiteside, "and whenever she has taken her walks abroad she has been followed, as you know. In accordance with your instructions I was taking off those shadows to-morrow, but to-day she went to Bond Street, and either Jackson was careless--it was Jackson who was on the job--or else the young lady was very sharp; at any rate, he waited for half an hour for her to come out of the shop, and when she didn't appear he walked in and found there was another entrance through which she had gone. Since then she has not been back to the hotel."

"I don't like that," said Tarling, a little troubled. "I wished her to be under observation as much for her own protection as anything else. I wish you would keep a man at the hotel and telephone me just as soon as she returns."

Whiteside nodded.

"I've anticipated your wishes in that respect," he said. "Well, what is the next move?"

"I'm going to Hertford to see Miss Rider's mother; and incidentally, I may pick up Miss Rider, who is very likely to have gone home."

Whiteside nodded.

"What do you expect to find out from the mother?" he asked.

"I expect to learn a great deal," said Tarling. "There is still a minor mystery to be discovered. For example, who is the mysterious man who comes and goes to Hertford, and just why is Mrs. Rider living in luxury whilst her daughter is working for her living at Lyne's Store?"

"There's something in that," agreed Whiteside. "Would you like me to come along with you?"

"Thanks," smiled Tarling, "I can do that little job by myself."

"Reverting to Milburgh," began Whiteside.

"As we always revert to Milburgh," groaned Tarling. "Yes?"

"Well, I don't like his assurance," said Whiteside. "It looks as if all our hopes of getting a clue from the examination of Lyne's accounts are fated to be dashed."

"There's something in that," said Tarling. "I don't like it myself. The books are in the hands of one of the best chartered accountants in the country, and if there has been any monkey business, he is the fellow who is certain to find it; and not only that, but to trace whatever defalcations there are to the man responsible. Milburgh is not fool enough to imagine that he won't be found out once the accountants get busy, and his cheeriness in face of exposure is to sa............