When the girl that detective Joe Hallenback is protecting gets murdered, the boyfriend of the murdered girl attempts to investigate and solve the case. What they discover is that there is deep seated corruption going on between a crooked politician and the owner of a pro football team.
Theresa is one of the twelve jurors who have to decide about a case of assassination. She believes very strongly in the innocence of the young man, but can't convince the others. During the discussions, she realizes that one member of the jury knows details that he couldn't know from the trial alone. Since no one believes her suspicions, she investigates on her own.
