Gray Nature is the third chapter of the third Part of Murder in the Alps, and the eleventh one overall. It's not yet available, no release date is currently known. As soon as the chapter 'Grey Nature' is released we will have a walkthrough and guide on SuperCheats.com to help you get through it.
In the meantime be sure to play the previous chapters in the series, so you are up-to-date when the 'Gray Nature' is released. Take a look at our guides to get help with them.
Part 1 (Chapter 1)
Part 2 (Chapter 2)
Chapter 3 (Chapter 3)