The secret of a stubborn scientist

You enter an apartment where a mad scientist previously lived. He was a loner and no one had ever seen him, only strange sounds could be heard from the apartment walls. On October 10, 2014, the sounds disappeared. The disturbed neighbors called the police, but upon opening the door, they found no one. At nights, mysterious sounds can still be heard. The scientist had disappeared, but perhaps he had never been there in the first place...? You must solve the mad scientist's mystery and manage to escape from the apartment before….