Das Bankett: Teil 2 – Der Fluch des Diamanten von Ramanpur

This a cooperative detective story!
From the beginning of the game you get all information (newspaper, interviews, links to websites etc.) and then you have to solve the case!

Although the robbery of the Ramanpur diamond was cleared up after the banquet, some puzzles remain unsolved. An illness afflicts the kitchen staff, an inexplicable red fog covers the hotel grounds and finally the von Schwarzburg twins have to undergo psychiatric treatment after they have mysteriously disappeared.
Are these events related to the curse of the diamond?

According to legend, the diamond curses anyone who gets hold of it. Uncover if there are indeed higher forces at work here or if there is a logical explanation for all events.