Grimm started working as an F.B.I. agent in 1995. His “most notable case,” as he described it to Van Susteren, was called Wooden Nickel, and it began in 2002. Working out of a corner office in the World Financial Center, Grimm adopted the persona of Michael Garibaldi—nicknamed Mikey Suits, for his impeccable dress—a Mob-connected stock and currency trader who ran a hedge fund called Centurion Consulting. The main investigation concerned a company that was suspected of illegally manipulating currency markets. Some months into the case, the F.B.I. added a further target: Albert Santoro, a thirty-one-year-old lawyer from Queens, who had recently come into contact with a man named Josef von Habsburg, one of the Bureau’s more colorful—and complicated—paid informants.