Mack Bolan had long entertained a bone feeling about San Francisco. His ground ear had been pulling him here ever since the nightmare in New York, the steady vibrations from that underculture of the national crime network telegraphing the insistent message that here was where the blood was at.

That certain feeling was intensified as the warwagon sped across the doubledecked engineering marvel known as the San Francisco-Oakland Bay Bridge and the fabulous skyline of that great old city came into view.

Down there was a population-density surpassed only in Manhattan, and a cosmopolitan atmosphere second to nowhere. It was more than a city; San Francisco was a way of life and a state of mind, an independence of the human spirit exuberantly expressed and often wildly exaggerated. There was the largest Chinatown outside the Orient, the most cohesive Italian community on the continent, and a general mixture of peoples and cultures more productive than any similar venture on the planet Earth.

It had started as the Spanish Presidio and Mission Dolores, in about the same year that the English colonies on the other American coast were proclaiming their independence. A scant fifteen years before the historic gold rush which put California on the continental map, the pueblo of Yerba Buena was established there, under the flag of Mexico, and in 1847 it was renamed San Francisco — a California Republic community of some eight hundred souls.

The discovery of gold at Sutler's Mill in 1848 produced a sprawling tent settlement of fortune hunters which was formally incorporated as the city and county of San Francisco in 1850. From this unlikely collection of miners, sailors, merchants, profiteers and prostitutes arose the queen city of the American West, cultural and financial center of the Pacific Coast, the grand old city beside the Golden Gate which now serves a metropolitan area of more than three million people, annually moving five billion tons of cargo through her seaport and fifteen million travelers through her airspace.