An Inspector Calls Act 1 is a pivotal part of J.B. Priestley's play, introducing key characters and themes. This act sets the stage for the Inspector's investigation into the Birling family's involvement in Eva Smith's death.

• The act opens with the Birling family celebrating Sheila's engagement to Gerald Croft
• Inspector Goole arrives unexpectedly, disrupting the celebratory atmosphere
• The Inspector reveals Eva Smith's suicide and begins questioning each family member
• Mr. Birling's role in Eva's dismissal from his factory is exposed
• Sheila's involvement in Eva's firing from Milwards is uncovered
• The act ends with tension building as the Inspector's investigation continues