The set takes place in the Art Deco metropolis of New Capenna, a city that has both grit and glamour. It is a place built by angels but now ruled by five demon crime families battling for supremacy. The fragile alliances that foster peace between the families are being strained to a breaking point as the precious commodity halo seems to be running out and someone known as "The Adversary" makes a power grab. Meanwhile, the planeswalker Elspeth Tirel arrives to investigate her past. Deep under the city, another outsider has his own plans.