The McMillans' maid Mildred is serving on the jury deliberating on the fate of San Francisco football star Luke Johnson, but one night she is attacked in her hotel. The jury is moved to a different hotel and in their vote for a decision, jurors vote to acquit Luke Johnson, except for juror Tom Ryan. Later that night when Jerry, a guard, gets a phone message for Tom Ryan from his stepmother Virginia Ryan, he and another guard go to Tom Ryan's hotel room, and find him shot to death. McMillan must now investigate two murders: the murder of Luke Johnson's teammate Moe Draper (the subject of the trial) and the murder of juror Tom Ryan. The McMillans and Enright question Luke Johnson's lawyer, the Ryan family, team manager Andrew Brill, and Jerry the guard, but several attempts are made on their lives, including an attempted shooting of Stewart at a football game, before Stewart makes a startling discovery about the way Tom Ryan died and in turn learns the true reason why Tom Ryan was killed.