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 …

…She didn't want to marry Eric so he gave her money as she wasn't employed anymore. She stopped taking money from him after she realised it was stolen. Shelia and Eric feel really guilty and blame themselves but the elder two Birling's think it had nothing to do with them. Gerald and Shelia now are not getting married and Shelia and Eric try to get the others to face up to what they have done.