A traditional detective story focuses on narrowing down from a list of numerous suspects to just one, but Inspector Goole does the opposite and shows that not one but all are responsible
"Because what happened to her then may have determined what happened to her afterwards, and what happened to her afterwards may have driven her to suicide."
The second clause in the sentence begins by repeating the last words of the previous clause, emphasising how the content of these statements is inextricably connected
Uses questions to interrogate the characters, but also delivers lines that seem to come directly from the mouth of Priestley to hammer home the message of social responsibility
Priestley's use of supernatural imagery in the inspector's final words
An allusion to the Biblical description of hell, adding to the supernatural, other-worldly aspect of Inspector Goole and helping us to remember his message