Mord am Schwarzdorn-See (Murder at Blackthorn Lake) contains two Midgard adventures for characters of levels 5-9.
Das Schlemmermahl (The Feast) is based on a Japanese story. The characters have to find the recipes and ingredients for a feast to please a cursed ghost.
In Mord am Schwarzdorn-See itself, the player characters have to find the murderer that poisoned the Jade Emperor. This adventure can be played as a follow-up to the Midgard adventure Die Perlen der Füchse.