The Chief Financial Officer of a baby food company is killed and the investigation by Jerry Orbach and Chris Noth lead to a Russian mob takeover. Allison Janney the head of the company was either clueless or just didn't want to know where that fresh infusion of money that her new partner brought. The partner is Victor Slezak, a Russian with an anglicized name.
The shooter is nabbed and he's caught dead bang with weapon. But connecting him to Slezak is not possible without Janney's testimony. She's frightened, but Moriarty wants to win this one bad. He wins but at a terrible price.
Note the appearance of Bob Dishy in the first several times as defense attorney Lawrence Weaver. Dishy was my favorite as an occasional lawyer for the accused, he even won a couple on the show.
This was Moriarty's last show and whatever you think of the rightness of his quarrel with Janet Reno you have to say he is a man of principle. This was a good farewell for Moriarty.