Protect the clean-up gang on the battlefield and earn yourself some crowns.
This is a simple quest but you need to be quick. Find the large battlefield area just south of the entrance to Novigrad, next to the Hangmans Tree signpost.
On here you'll find a lot of people wandering around the dead. One of those people will give you a job protecting his men while they clean up the bodiesd. If you agree you'll be attacked by Ghouls.
You need to fight them and stay near the clean-up crew. If you wander too far they'll get attacked and killed. Don't be tempted to chase after Ghouls, wait for them to come to you.
Once they're all dead go back to the boss for your reward.