gh the street after dark, and I
don't see why he didn't notice what was going on over there last night.
If a man's attacked, he generally calls for help; it's a queer business
all right."

"Well, Sultan, why didn't you make a noise?" asked Muller, patting the
dog's broad head. Sultan growled and walked on indifferently, after he
had shaken off the strange hand.

"He must have slept more soundly than usual. He went off into the
country with me yesterday. We had an errand to do there and on the
way back we stopped in for a drink. Sultan takes a drop or two himself
occasionally, and that usually makes him sleep. I had hard work to bring
him home. We got here just a few minutes before half-past nine and I
tell you we were both good and tired."

By this time they had come to the elder-tree and the old man's stream of
talk ceased as he stood before the spot where the mysterious crime had
occurred. He looked down thoughtfully at the grass, now trampled by many
feet. "Who could have done it?" he murmured finally, with a sigh that
expressed his pity for the victim.

"Hietzing is known to be one of the safest spots in Vienna," remarked
Muller.

"Indeed it is, sir; indeed it is. As it would well have to be with the
royal castles right here in the neighbourhood! Indeed it would have to
be safe with the Court coming here all the time."

"Why, yes, you see more police here than anywhere else in the city."

"Yes, they're always sticking their nose in where they're not
necessary," remarked the old man, not realising to whom he was speaking.
"They fuss about everything you do or don't do, and yet a man can be
shot down right under our very noses here and the police can't help it."

"But, my dear sir, it isn't always possible for the police to prevent a
criminal carrying out his evil intention," said Muller good-naturedly.

"Well, why not? if they watch out sharp enough?"

"The police watch out sharper than most people think. But they can't
catch a man until he has committed his crime, can they?"

"No, I suppose not," said the old man, with another glance at the
elder-tree. He bowed to Muller and turned and walked away.

Muller followed him slowly, very much pleased with this meeting, for
it had given him a new clue. There was no reason to doubt the old man's
story. And if this story was true, then the crime had been committed
before half-past nine of the evening previous. For the old man--he was
evidently the janitor in No