Their happiness did not last long, however. Johnny needed money more than ever now and resumed his dangerous business. He got in with a quartette of the cleverest safe-crackers in the country, and made a tour of the Eastern cities. They made many important touches, but finally Johnny was again under suspicion for a daring robbery in Union Square, and was compelled to become a solitary fugitive. He sent word, through an old-time burglar, to Mamie, exhorted her to keep up the home, and promised to send money regularly. He was forced, however, to stay away from New York for several years, and did not dare to communicate with Mamie.
At first, Mamie tried to resume her work at box-making. But she had had so much leisure and had lived so well that she found the work irksome and the pay inadequate. Mamie knew many women pickpockets and shop-lifters, friends of her husband. When some of these adventurous girls saw that Mamie was discontented with her lot, they induced her to go out and work with them. So Mamie became a very clever shop-lifter, and, for a time, made considerable money. Then many of the best "guns" in the city again tried to make up to Mamie, and marry her. Johnny was not on the spot, and that, in the eyes of a thief, constitutes a divorce. But Mamie still loved her wayward boy and held the others back.
In the meantime Johnny had become a great traveller. He knew that the detectives were so hot on his track that he dared to stay nowhere very long; nor dared to trust anyone: so he worked alone. He made a number of daring robberies, all along the line from Montreal to Detroit, but they all paled in comparison with a touch he made at Philadelphia, a robbery which is famous in criminal annals.
He had returned to Philadelphia, hoping to get a chance to send word to Mamie, whom he had not seen for years, and for whom he pined. While in the city of brotherly love he was "tipped off" to a good thing. He boldly entered a large mercantile house, and, in thirteen minutes, he opened a time-lock vault, and abstracted three hundred thousand dollars worth of negotiable bonds and escaped.
The bold deed made a sensation all over the country. The mercantile house and the safe manufacturers were so hot for the thief that the detectives everywhere worked hard and "on the level". Johnny was not suspected then, and never "did time" for this touch. For a while he hid in Philadelphia; boarded there with a poor, respectable family, representing himself as a laborer out of work. He spent the daytime in a little German beer saloon, playing pinocle with the proprietor; and was perfectly safe.