Alternate-history, present day. What we think of as the USA is a Republic with shades of Ancient Rome. It’s also a harsh surveillance state, where conforming to society’s strictures is of paramount importance.
Lavinia is a civil servant with a sincere belief in the state, although she’s not above bending the rules a bit – especially when it comes to her family. Her younger sister Antonia is a rebellious, unrepentant atheist – and atheism is unacceptable to this society, where polytheism is enforced.
Lavinia wants Toni to make a show of things; at least pay lip service to the rules. But Toni has ideals.
This is an extremely well-crafted iteration of this moral/ethical dilemma. I believe that people on both sides of the argument will find themselves empathizing with both women.