The Keepers

It's getting dark in Frauenfeld when the apartment door of Grandfather opens. He is gone. All he left me is a sealed envelope marked with strange symbols. The handwriting is unmistakable: it is grandfather’s. "I have spent my whole life uncovering hidden truths. But one mystery has always eluded me. It has haunted me for decades. You are bright and curious. I entrust you with all the knowledge I have gathered. Hidden in Frauenfeld is a small box with the most important documents I collected. I believe there are more clues waiting to be found. Discover them all and piece this puzzle together." He had always been an eccentric man, but this is beyond any expectations. It raises so many questions. What was he looking for? What is in this box? There’s only one way to discover it: finding the clues hidden around Frauenfeld.