In early 1990s Boston, ADA, Decourcy Ward, forms an unlikely alliance with a corrupt venerated FBI veteran, Jackie Rohr. Together, they take on a case that changes the city's entire criminal justice system.

A couple get into an argument at their cocktail party that escalates until it brings an abrupt end to the festivities. They and their guests decide to re-create the entire night again and again to determine who was right.