The real Pinkerton's National Detective Agency is the basis for this crime drama series that follows the agency's founder, Allan, as he solves crimes in the 1860s, with help from his son, William, and Kate Warne, America's first female operative to pursue criminals in the Wild West of that era. Episodes of "The Pinkertons" draw on actual cases that the company -- which became known for developing the use of surveillance, undercover work and mugshots -- investigated.