The phone in your detective agency is finally ringing again after a long, long time. At the other end of the line: the head of one of the well-known Düsseldorf Altbier breweries. Completely devastated, he tells that his longtime brewer has disappeared without a trace - and only he knows the recipe for the delicious Altbier. So the supply of beer is in danger! And what happened to the master brewer? The boss of the brewery wants to hire you: you should find the brewer and the recipe. You hesitate a bit: the brewery boss promises you that one of his best employees will help you with your search. And there is also a locked suitcase near the brew kettle. And as expenses you can negotiate two drinks (soft drink or Altbier) and delicious brewery snacks. Now it's up to you: Do you accept the assignment??? This tour is about three kilometers long, leads through the old town and will be accompanied by a guide / live actor the whole time. You have to solve riddles to get to the next station. You will find the riddles inside the suitcase and at several locations. The aim is to track down the secret of the missing brewer and find the reciepe of his special Altbier.