Rankin Fitch (GENE HACKMAN) is a highly successful and pricey jury consultant whose firm investigates potential jurors to such a fine degree that they can pretty much help their clients choose a jury that will vote their way. He's recently been hired by Garland Jankle (STANLEY ANDERSON), the CEO of Vicksburg Firearms, a gun manufacturer and plaintiff in a high profile civil court case brought on by the widow of a man gunned down by one their products.
Employing a large team of high tech workers and investigators, including Doyle (NICK SEARCY), Fitch is working closely with the lead counsel for the defense, Durwood Cable (BRUCE DAVISON), in picking out jurors likely to be friendly to their argument.
On the other side of the case is the decidedly low-tech Wendall Rohr (DUSTIN HOFFMAN), a New Orleans attorney. Against his better judgment, he's hired his own jury consultant, Lawrence Green (JEREMY PIVEN), but relies on his knowledge of the law and gut instincts more than any outside help.
Among the jurors selected is Nick Easter (JOHN CUSACK), who's reluctant to serve; ex-drill sergeant Frank Herrera (CLIFF CURTIS); Herman Grimes (GERRY BAMMAN), who's blind; secret drinker Stella Hullic (NORA DUNN) and others. Ruled over by Judge Harkin (BRUCE McGILL), they prepare to hear the case. Just as it begins, however, both sides receive an anonymous note indicating that the jury is for sale.
While Rohr blows it off as a ploy by the defense, Fitch takes it seriously and begins to investigate where it's from. He eventually discovers that one of the jurors is in cahoots with the letter writer, Marlee (RACHEL WEISZ), who informs both sides that they can purchase a jury decision for the right price. With millions of dollars at stake, the outside forces try to manipulate the legal teams, all while Fitch tries to crack down on the outsiders.