L’inquietant Professeur Tychsen [The Unsettling Professor Tychsen]

Friedrich Wilhelm University, January 3rd, 1920 Hans Drummer, your comrade and friend, has been missing for a week. Your suspicions fall on your archeology teacher, Gerhardt Tychsen, whose behavior is weird. Today, he is giving a lecture : this is the perfect opportunity to break into his office and investigate. You have one hour before the professor comes back. Will you find your friend ?