He ends up driving there with the diplomat, who later disappears during the party. McCrea then follows him to where people say he went — a political conference — only to see him assassinated on the steps as he enters. McCrea follows the assassin to the countryside, where he finds the diplomat alive and held hostage. And thus ensues a plot to uncover a political conspiracy. It’s a really solid film. Not as well remembered as his later thrillers, but very, very solid.