"Right," said Tommy, and replaced the receiver on its hoof`.

Then he turned to Tuppence.

"That was the Chief. Seems to have got the wind up about us. It appears that the parties we're after have got wise to the fact that I'm not the genuine Mr. Theodore Blunt. We're to expect excitements at any minute. The Chief begs you as a favor to go home and stay at home, and not mix yourself up in it any more. Apparently the hornet's nest we've stirred up is bigger than anyone imagined."

"All that about my going home is nonsense," said Tuppence decidedly. "Who is going to look after you if I go home? Besides, I like excitement. Business hasn't been very brisk just lately."

"Well, one can't have murders and robberies every day," said Tommy. "Be reasonable. Now my idea is this. When business is slack, we ought to do a certain amount of home exercises every day."

"Lie on our backs and wave our feet in the air? That sort of thing?"

"Don't be so literal in your interpretation. When I say exercises, I mean exercises in the detective art. Reproductions of the Great Masters. For instance-"

From the drawer beside him, Tommy took out a formidable dark green eyeshade covering both eyes. This he adjusted with some care. Then he drew a watch from his pocket.

"I broke the glass this morning," he remarked. "That paved the way for its being the crystalless watch which my sensitive fingers touch so lightly."

"Be careful," said Tuppence. "You nearly had the short hand off then."

"Give me your hand," said Tommy. He held it, one finger feeling for the pulse. "Ah! the keyboard of silence. This woman has not got heart disease."

"I suppose," said Tuppence, "that you are Thornley Colton?"

"Just so," said Tommy. "The blind Problemist. And you're thingumrnybob, the black-haired apple-cheeked secretary-"

"The bundle of baby clothes picked up on the banks of the English river," finished Tuppence.

"And Albert is the Fee, alias Shrimp."

"We must teach him to say 'Gee,' " said Tuppence. "And his voice isn't shrill. It's dreadfully hoarse."

"Against the wall by the door,' said Tommy, "you perceive the slim hollow cane which held in my sensitive hand tells me so much."

He rose and cannoned into a chair.

"Damn!" said Tommy. "I forgot that chair was there."

"It must be beastly to be blind," said Tuppence with feeling.

"Rather," agreed Tommy heartily. "I'm sorrier for all those poor devils who lost their eyesight in the War than for anyone else. But they say that when you live in the dark you really do develop special senses. That's what I want to try and see if one couldn't do. It would be jolly handy to train oneself to be some good in the dark. Now, Tuppence, be a good Sydney Thames. How many steps to that cane?"

Tuppence made a desperate guess.

"Three straight, five left," she hazarded.

Tommy paced it uncertainly, Tuppence interrupting with a cry of warning as she realised that the fourth step left would take him slap against the wall.

"There's a lot in this," said Tuppence. "You've no idea how difficult it is to judge how many steps are needed."

"It's jolly interesting," said Tommy. "Call Albert in. I'm going to shake hands with you both, and see if I know which is which."

"All right," said Tuppence, "but Albert must wash his hands first. They're sure to be sticky from those beastly acid drops he's always eating."

Albert, introduced to the game, was full of interest.

Tommy, the hand shakes completed, smiled complacently.

"The keyboard of silence cannot lie," he murmured. 'The first was Albert, the second, you, Tuppence."

"Wrong!" shrieked Tuppence. "Keyboard of silence indeed! You went by my wedding ring. And I put that on Albert's finger."

Various other experiments were carried out, with indifferent success.

"But it's coming," declared Tommy. "One can't expect to be infallible straight away. I tell you what. It's just lunch time. You and I will go to the Blitz, Tuppence. Blind man and his keeper. Some jolly useful tips to be picked up there."

"I say, Tommy, we shall get into trouble."

"No, we shan't. I shall behave quite like the little gentleman. But I bet you that by the end of luncheon I shall be startling you."

All protests being thus overborne, a quarter of an hour later saw Tommy and Tuppence comfortably ensconced at a corner table in the Gold Room of the Blitz.

Tommy ran his fingers lightly over the Menu.

"Pilaff de Homard and Grilled Chicken for me," he murmured.

Tuppence also made her selection, and the waiter moved away.

"So far, so good," said Tommy. "Now for a more ambitious venture. What beautiful legs that girl in the short skirt has-the one who has just come in."

"How was that done, Thorn?"

"Beautiful legs impart a particular vibration to the floor which is received by my hollow cane. Or, to be honest, in a big Restaurant there is nearly always a girl with beautiful legs standing in the doorway looking for her friends, and with short skirts going about, she'd be sure to take advantage of them."

The meal proceeded.

"The man two tables from us is a very wealthy profiteer, I fancy," said Tommy carelessly.

"Pretty good," said Tuppence appreciatively. "I don't follow that one."

"I shan't tell you how it's done every time. It spoils my show. The head waiter is serving champagne three tables off to thee right. A stout woman in black is about to pass our table."

"Tommy, how can you-"

"Aha! You're beginning to see what I can do. That's a nice girl in brown just getting up at the table behind you."

"Snoo!" said Tuppence. "It's a young man in grey."

"Oh!" said Tommy, momentarily disconcerted.

And at that moment two men who had been sitting at a table not far away, and who had been watching the young pair with keen interest, got up and came across to the corner table.

"Excuse me," said the elder of the two, a tall well dressed man with an eyeglass and a small grey moustache. "But you have been pointed out to me as Mr. Theodore Blunt. May I ask if that is so?"

Tommy hesitated a minute, feeling somewhat at a disadvantage. Then he bowed his head.

"That is so. I am Mr. Blunt."

"What an unexpected piece of good fortune! Mr. Blunt, I was going to call at your offices after lunch. I am in trouble-very grave trouble. But-excuse me-you have had some accident to your eyes?"

"My dear sir," said Tommy in a melancholy voice. "I am blind-completely blind."

"What?"

"You are astonished. But surely you have heard of blind detectives?"

"In fiction. Never in real life. And I have certainly never heard that you were blind."

"Many people are not aware of the fact," murmured Tommy. "I am wearing an eyeshade today to save my eyeballs from glare. But without it, quite a host of people have never suspected my infirmity-if you call it that. You see, my eyes cannot mislead me. But enough of all this. Shall we go at once to my office, or will you give me the facts of the case here? The latter would be best, I think."

A waiter brought up two extra chairs, and the two men sat down. The second man, who had not yet spoken, was shorter, sturdy in build and very dark.

"It is a matter of great delicacy," said the older man dropping his voice confidentially. He looked uncertainly at Tuppence. Mr. Blunt seemed to feel the glance.

"Let me introduce my confidential secretary," he said. "Miss Ganges. Found on the banks of the Indian river-a mere bundle of baby clothes. Very sad history. Miss Ganges is my eyes. She accompanies me everywhere."

The stranger acknowledged the introduction with a bow.

"Then I can speak out. Mr. Blunt, my daughter, a girl of sixteen, has been abducted under somewhat peculiar circumstances. I discovered this half an hour ago. The circumstances of the case were such that I dared not call in the police. Instead I rang up your office. They told me you were out to lunch, but would be back by half past two. I came in here with my friend Captain Harker-"

The short man jerked his head and muttered something.

"By the greatest good fortune you happened to be lunching here also. We must lose no time. You must return with me to my house immediately."

Tommy demurred cautiously.

"I can be with you in half an hour. I must return to my office first."

Captain Harker, turning to glance at Tuppence, may have been surprised to see a half smile lurking for a moment at the corners of her mouth.

"No, no, that will not do. You must return with me." The grey haired man took a card from his pocket and handed it across the table. "That is my name."

Tommy fingered it.

"My fingers are hardly sensitive enough for that," he said with a smile, and handed it to Tuppence, who read out in a low voice: "The Duke of Blairgowrie."

She looked with great interest at their client. The Duke of Blairgowrie was well known to be a most haughty and inaccessible nobleman who had married as a wife the daughter of a Chicago pork butcher, many years younger than himself, and of a lively temperament that augured ill for their future together. There had been rumors of disaccord lately.

"You will come at once, Mr. Blunt?" said the Duke, with a tinge of acerbity in his manner.

Tommy yielded to the inevitable.

"Miss Ganges and I will come with you," he said quietly. "You will excuse my just stopping to drink a large cup of black coffee? They will serve it immediately. I am subject to very distressing headaches, the result of my eye trouble, and the coffee steadies my nerves."

He called a waiter and gave the order. Then he spoke to Tuppence.

"Miss Ganges-I am lunching here tomorrow with the French Prefect of Police. Just note down the luncheon, and give it to the head waiter with instructions to reserve me my usual table. I am assisting the French Police in an important case. The fee-" he paused-"is considerable. Are you ready, Miss Ganges?"