Miasma

You are the quarantine council of a walled city in the plague year of 1348, and the sickness is already inside the walls. Each week you may seal a fixed number of orders: bar a street, open a pest house, lime the doors, hold the ships, shut the market, give out grain. Under the painted isometric city runs a real epidemic model, one per quarter, coupled by the traffic between them — and what is reported to you is always last week's truth. Close the market and the poor quarter starves. Each year ends in a chronicle naming the dead and the saved.