What is the role of the inspector and what happens in the rest of the play?

An inspector calls is set in 1912 but was written in 1945. The story is about an inspector interrogating a family about the death of a girl. He speaks to them one at a time and shows them a photograph or Eva. He gets them to confess what they did and he convinces they that they all helped to kill her.
Inspector Goole's name is an obvious pun on 'ghoul' a spirit or a ghost. The name makes him sound ghostly and he seems very confident when he speaks. When he walks in the room he isn't a big man but made to seem big "he creates an impression of massiveness and purposefulness." So we know tha…