Although all deputy U.S. Marshals go through a rigorous three-month training program, their real education takes place on the street. The program follows three rookies as they work with more experienced deputies to find a bank robber and a drug-runner. Rookie Andra Ruiz, under the guidance of veteran Deputy Mike Plotts, searches for Bertha Perez, aka Big Bertha, a member of a nation-wide drug ring. Kenneth Burfield, a veteran with six years field experience, is tracking a fugitive named Kenneth Collins. Collins' warehouse yielded 10 tons of marijuana. Another rookie, Edward Flores, works with Deputy Matt Collins to catch Stephen Banister, who is believed to have robbed several banks.