The play is set in the1912 on an English street scene in the evening.
The plot of 'An Inspector Calls' is about a police inspector who interrupts an elegant engagement dinner party to question the family and their guests about an unsuspected suicide of a young working-class girl called Eva Smith. There are many plot twists and changes which work well with the characters portrayed in Priestley's play. The play is set in an upper-class household where class distinctions are breaking down, where privilege and responsibility are being challenged by a devious so-called inspector Goole.
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