The unsuspecting Birling family are visited by the mysterious Inspector Goole. He arrives just as they are celebrating the engagement of Sheila Birling to Gerald Croft. The Inspector reveals that a girl called Eva Smith, has taken her own life by drinking disinfectant. The family are horrified but initially confused as to why the Inspector has called to see them. What follows is a tense and uncomfortable investigation by an all-knowing Inspector through which the family discover that they are all in fact caught up in this poor girl's death.