C46 Mysterious gemini

The antique clock on the wall chimed twelve times in a dull rhythm at midnight, and Cao Tianjiao stretched out at her desk: she would have fallen asleep in her warm bed by this time of night. However, she didn't dare to relax even though she was staring at the messages on the silver screen of the laptop in front of her.

Drip, drip!

Accompanied by a soft electronic voice