The quest will be provided by Manfred from New Serene. Visit the Coin Guard headquarters after you deal with the rebels headed by the general in the quest Treason!. Head to the tavern and talk to the innkeeper. Then, move to the port and talk to the customs officer. You can bribe him with 100 coins or apply intuition (3 points!), showing a silver coin. In the other case, you’ll have to find the key by yourself.
We have chosen the second option since the key is located in the nearby. Look towards the water and see an orange glow at the end of the pier. Grab the key from the box and look inside the chest to find a note. Talk to the customs officer, meet him by the gates and run together to the meeting place. Hide behind the fence and bend down, pressing C. When the meeting takes place, you’ll have a choice – pursue the enemy or help the customs officer. The runaway man is not Egon so there’s no need to chase him. Jump down and help the customs officer who helped you. After this, you’ll talk to the man.
Leave the location and head to a new one where the infirmary is located. You can fight your way or go through the stables on the side, hiding in the grass. As soon as you defeat Ludwig himself, the fight will end. Return to New Serene and talk to Manfred.
Reward: 1600 experience points, +3 to reputation with the Coin Guard, 50 coins.