“Really?” I said.

“Um,” grunted S. K.

“What year did Burr kill Alexander Hamilton?” I questioned further.

“1804.”

“Why,” I exclaimed, “that was the year the Jumels were married. Wasn’t that strange--I mean, considering that she married Aaron Burr later?”

“Yes.”

“It was a terrible thing for Burr to do, wasn’t it?” I said, and then I added that I was glad duelling had gone out of style and wasn’t allowed any more.

“If some of to-day’s politicians would shoot each other,” said S. K., “it would be a great thing for the country, and I don’t see how they could hit the wrong man.”

That was the longest speech he made all the way home. Something had made him very cross and pessimistic. I gave up trying to make talk and absorbed and made use of the prevailing silence. That worried S. K., who, I think, didn’t want to share the silence that he was using for an umbrella to cover his grouch. He looked at me several times as we whirled upstairs, but I pretended I was completely absorbed in the little iron plack that says the elevator is inspected by inspectors every two weeks. But of course I was not deeply interested in it, having almost learned it by heart when riding in the elevator with people at whom I didn’t want to stare.

In S. K.’s apartment we began to disagree about getting a detective once more, for that was the plan. S. K. really did it well. He walked up and down, using his cane very heavily, and once and again almost thumping with it.