1) The Birling family is celebrating the engagement of Sheila and Gerald at a dinner party where Mr. Birling, the dominant father, talks dismissively about his business and children.
2) An inspector arrives to question them about the recent suicide of a young woman, Eva Smith. He unsettles the family with his serious demeanor.
3) Through the inspector's questioning, it is revealed that each family member contributed in some way to Eva Smith's downward spiral, from Mr. Birling firing her to Sheila getting her fired from a shop, implicating them all in her death.