But the temper of a crowd is subject to abrupt changes. A minute passed and the old woman did not return. It suddenly struck the people that the well-dressed Jack, proud, angry and silent, did not much resemble a purse-snatcher. Jack, feeling the change, said scornfully:
"Do you see her coming back? I tell you it's a frame-up."
The men who had hold of Jack became uncertain, and finally let go. Jack elbowed his way out, and none sought to stop him now. The crowd dissolved. The whole incident had occupied less than two minutes, but that was long enough to do the mischief. The packet presumably had been handed over, and both messenger and principal swallowed up.
Jack hastened over the remaining distance to the corner of Forty-Second street. Neither the sallow youth nor the old gentleman with the imperial was visible of course. Jack hesitated at a loss which way to turn. There was a chance that the old man, having received the money, had turned Westward and so might be intercepted by Connolly, but it was a faint one.
While Jack stood there the traffic officer at that important crossing gave the signal for the East and West-bound traffic to cross, and a double line of cars darted across Seventh Avenue. Fourth in the line of those bound East Jack saw the long black limousine that had been so often described to him.
As it flashed by he had a glimpse of a silk-hatted head with gray hair brushed forward of the ears, ruddy complexion, gray moustache and imperial. Alongside was the rusty black bonnet and the brown wig. The man's head was down, and his attitude suggested he was counting something in his lap. The woman's glance followed his.
It was Jack's first glimpse of his quarry, and his hunting instinct was spurred to action. He made a zig-zag dash across the street under the very wheels of motors and trolley cars. The black limousine was out of his reach, but by great good luck he found a taxicab standing by the curb with its engine running.
He flung himself in, crying: "Four times your fare if you can keep that car in sight. A hundred dollars if I am able to arrest the couple in it!"
The taxi leaped ahead. Jack lowered the front window, and leaning forward, pointed out the right car to the chauffeur. In a wild spurt down Forty-Second street they gained half a block on the limousine. They just managed to get across Sixth avenue before the whistle blew. At Fifth the whole line was held up for perhaps half a minute. The press was so great here, Jack could not see the black car, but he had carefully marked its position, about six cars ahead.
When the whistle blew for the East and West traffic to resume they saw it turn down Fifth with a burst of speed. They followed. In and out of the close traffic the big car threaded its way with a wonderful exhibition of sang-froid on the part of the chauffeur. Jack had a good chauffeur too. But a race through such a crowd is purely a matter of luck. They never succeeded in getting within less than five car lengths of their prize. Jack saw that the black car now bore a Georgia license. He made note of the number.