My wife examined the packages in turn.

"You're perfectly right," she said. Then, "Good Heavens!" she cried.

"Perhaps I gave that woman the wrong one, after all."

I shrugged my shoulders.

"I don't suppose she cared. What's in a name? They're each of them worth four pounds."

"That's true," said Adele musingly. "Still...."

We opened them one by one.

The first was the Black Lily.

Then came the Grey Jasmine.

I ripped the paper off the third case and laid it upon the table.

With my fingers about the cardboard, I paused.

"And what," said I, "is the betting?"

"Blue Rose," cried Jill.

"Red Violets," said Adele.

I opened the case.

They were both wrong.

The tray contained no perfume at all.

Crammed into the form of a scent-bottle was a dirty huddle of wash-leather.

I lifted it out between my finger and thumb.

The diamond and emerald necklace which lay beneath must have been worth a quarter of a million.

"Yes," said the British Vice-Consul, some two hours later, "this little seaside town is a sort of Thieves' Parlour. Four-fifths of the stuff that's stolen in Spain goes out of the country this way. As in the present case, the actual thief daren't try to cross the frontier, but he's always got an accomplice waiting at San Sebastian. We know the thieves all right--at least, the police do, but the accomplices are the devil. Often enough, they go no further than Biarritz, and there are so many of the Smart Set constantly floating between the two towns that they're frightfully hard to spot. In fact, about the only chance is to trace their connection with the thief. What I mean is this. A's got the jewels and he's got to pa.s.s them to B. That necessitates some kind of common denominator. Either they've got to meet or they've got to visit--at different times, of course--the same bureau....

"Well, there you are.

"By the merest accident you stumbled upon the actual communication of the pa.s.sword by A to B. The voice you heard upon the telephone was that of the original thief, or of his representative. This morning you visited the actual bureau. I know the place well. My wife's bought scent there. It's always been a bit of a mystery, but I never suspected this. I've not the slightest doubt it's been used as a bureau for years. Well, in all innocence you gave the pa.s.sword, and in all innocence received the gems. B arrives too late, finds that you have them, and starts in pursuit. I've no doubt she really ran on to see which way you'd gone. She couldn't have hoped to catch you on foot. Of course, she couldn't understand how you'd come by the pa.s.sword, but the few words you'd had with her the night before made her suspect your innocence. Still, she wasn't sure, and that's why her chauffeur fetched up across your bows."

"You don't mean----"

"I do indeed. If you hadn't handed them over, they'd have been taken by force....

"Well, finding that either by accident or design she's been sold a pup, B communicates with the gang, and, while you're out, your rooms are ransacked."

"And I walked," I said, "after dark from the Calle de Miracruz to this hotel with the baubles under my arm."

The Vice-Consul laughed.

"The armour of ignorance," he said, "will sometimes turn the keenest wits. The confidence it gives its wearer is proverbial."

"But why," said Adele, "was the shop-girl so terribly nervous? I mean, if she's used to this sort of traffic...."

The Vice-Consul fingered his chin.

Then he picked up the jewels.

"Perhaps," he said slowly, "perhaps she knew where they came from."

"Where was that?" said Daphne.

The Vice-Consul frowned.

"When I last saw them," he said, "they were in the Royal Treasury."

At half-past ten the next morning I was walking upon the golf links of St. Jean-de-Luz.

I was not there of choice.

Two very eminent detectives--one French and one Spanish--were upon either side of me.

We were close to the seventh green, when the Frenchman touched me upon the arm.

"Look, sir," he said, pointing. "There is a golf party coming. They are making, no doubt, for this spot. When they arrive, pray approach and look at them. If you should recognise anyone, I beg that you will take off your hat."

He bowed, and a moment later I was alone.

I sat down on the turf and took out a cigarette....

With a plop, a golf ball alighted upon the green, trickled a few feet, and stopped a yard from the hole. Presently, another followed it, rolled across the turf, and struggled into the rough.

I got upon my feet and strolled towards the green....

It was a mixed foursome.

In a cherry-coloured jumper and a white skirt, Eulalie looked prettier than ever.

She saw me at once, of course, but she took no notice.