An Inspector Calls by J. B. Priestly

This classic suspense play, set in 1912 England, has a timeless quality which is why it is currently enjoying revivals throughout the English-speaking world. It starts with a family celebrating their daughter’s betrothal only to be interrupted by a Police Inspector who establishes through questioning that each of them played a part in a young, poor woman’s death. 

As they each realize their part some more, the less they are unprepared (as are we) for a very surprising ending.