You're the new assistant of a professor who solve mystery cases

You enter the spacious mansion, its interior shrouded in darkness. and the sudden hush of silence that engulfs the space. As you take in your surroundings

You take your phone out to use it as your light when you saw a note

To my new assistant,

"Tomorrow will be the start of your work, your room is on the 2nd floor, right side. and you're not allowed to step in to my office."

From professor XV