“But in such cases,” continued Blake, “the maid would often be left to follow with the luggage, the ladies taking no more than what they required for the night. But nothing was said to the maid yesterday on the subject, and I can’t think Mrs. Vanderstein would ever go off like that anywhere, sir, in her evening dress and diamonds.”

“Of course, it being a gala night at the opera, she would be wearing jewels,” Gimblet assented.

“Yes, sir, and that’s partly what makes me feel so upset, sir; I’ve never known Mrs. Vanderstein to wear so many jewels on one occasion. It would have been well worth anyone’s while to rob her last night, sir.”

“Really. What was she wearing? Had she valuable jewels?”

“Indeed, yes,” broke in Sir Gregory, “the Vanderstein jewels were famous.”

“Yes, sir,” repeated Blake; “beautiful jewellery indeed. A great responsibility, sir, in a household. But I have them always in a safe in the pantry, where I sleep myself, and if I go out in the daytime it’s never without one of the footmen stays in the room all the time I’m away. At night we have a night watchman always on the premises, sir, and it was him that first alarmed me this morning. He came to my door about five o’clock and knocked me up. ‘What’s the matter?’ I called out, thinking at first what with sleep and one thing and another that the house was on fire. ‘She haven’t come in yet,’ he said, and it was a few minutes before I understood what he was driving at. And then I didn’t really feel anxious; though we’d all thought it very strange last night, when Thomas, the second footman, who had gone with the motor to Covent Garden, came back saying that he’d received orders that the car wasn’t to go back to fetch the ladies at all.”

“What? the car was not to go back after the performance?” exclaimed Gimblet.

“No, sir, orders were given to that effect. Still, I thought possibly they were coming home with some friends, and even this morning I said to myself that perhaps they were staying the night at a friend’s house, having for some reason not been able to get a cab home. I had no doubt I should get a telephone message at any moment, which would explain the whole of the circumstances. But the morning passed away without our hearing anything whatever, and by the time Sir Gregory called I was just about getting ready to go out and make inquiries at the police station.”

Gimblet considered in silence for a few moments.

“Have you noticed anything unusual of late,” he asked, “in the habits or demeanour of anyone in the house?”