Achromatic

Rummage through the rooms, find objects, papers, compare them to what the notebook gives you, and try to analyze it all. In Achromatic, your deduction will be your best ally. Immerse yourself in a dark mood, tributing the Film Noir cinema genre: black and white graphics on your computer, colors on your notebook, lighting games, muffled mood, jazz music and more.

You found a strange notebook in your mailbox. On the first page, an address. By going there, you know that this track will lead you to the clues you need in order to choose between 9 of your suspects.