What if someone gave you a box containing a button that, if pushed, would bring you a million dollars... but simultaneously take the life of someone you don't know? Would you do it? And what would be the consequences?

The year is 1976. Norma Lewis (Cameron Diaz) is a teacher at a private high school and her husband, Arthur (James Marsden), is an engineer working at NASA. They are, by all accounts, an average couple living a normal life in the suburbs with their young son... until a mysterious man with a horribly disfigured face appears on their doorstep (Frank Langella) and presents them with a life-altering proposition: the box.

With only 24 hours to make their choice, Norma and Arthur face a momentous moral dilemma. They soon discover that the ramifications of this decision are beyond their control and extend far beyond their own fortune and fate.