THE sedan remained a while after the limousine had gone. The man who had left it had returned. He watched the street on both sides.

He saw a cab pull up on the other side; it discharged two passengers, who argued about who should have the privilege of paying the driver.

The cab pulled away; and the man watching it from the sedan never detected the blotch of blackness that flitted into the back seat just before the driver closed the door.

The taxi driver did not see it either. In fact, he was stupefied, a short while later, when a head appeared from the interior of the cab, and he was given an address by a passenger whose presence he had not suspected.

The cabman was somewhat in a quandary about how to regulate the meter; for he did not know when his passenger had arrived. But the man in back settled that matter, by handing him more than sufficient payment.

The sedan pulled away not long after the cab. It wended its way uptown, again, and stopped for nearly an hour in front of Prince Zuvor’s house. Then one of the occupants alighted, and walked along the street, while the other drove away.

The man who was on foot was an observant fellow; but he did not see the peculiar shadow that had suddenly detached itself from the house that he had been watching.

He stopped at a restaurant, and his companion joined him. The other had put the car in a garage. The two men sat and talked.

They scarcely observed a quiet, black-clad individual, who sat in a corner, eating alone.

Leaving the restaurant, the men walked along a street, and their shadows moved with them, by the curb.