You are sitting in the library and reading an article on the computer. An unknown number called you.

"Hello..."

You hear a hoarse male voice when you pick up the phone.

"How are you?"

You turn off your phone, thinking it's just another spam. Within a couple of minutes, the unknown person called you three more times, but you no longer accepted the call. The main light in the library goes out. The place is lit only by a computer screen and dim light bulbs.