Two executives find signs of a struggle in their conference room, and on the floor of an adjacent room, a naked, bound and gagged co-worker who had been raped. While in the hospital for treatment, feds arrest the victim for assorted financial crimes before Benson and Stabler can get her statement. Trace evidence shows the perp suffers from probably untreated diabetes, and raped at least two other women. The detectives identify a suspect, but find it hard to locate him because he's in the fed's witness protection program.