The document provides background information on J.B. Priestley, who wrote the play "An Inspector Calls", and the historical and social context of the time period in which the play is set (1912) and when it was written (1946). It discusses the differences between capitalist and socialist ideologies represented in the characters and themes. It then gives a brief plot summary of the play in 3 acts and discusses its structure as a "well-made play". Key facts are provided on the main characters of Mr. Birling, Sheila Birling, and Mrs. Birling.