When you're marked you have two choices; fight or die.
The city is almost an exact replica of 21st century society. In a impoverished futuristic world, the city is a beautiful relic that preserves the pinnacle of human society. The one major difference however, is that every two years the government will have a type of cleaning ritual. 200 citizens of the city are marked as targets.
A marked person is never safe. The reward for killing them is frighteningly high. Not to mention that a marked person's only means of survival is to kill one another. If you are lucky enough to survive the two months then you are granted the privilege to travel in and out of the city as you wish.
My name is Nance and it's my turn to be marked.