Fu Chao gave Chen Yudong a meaningful look, and Chen nodded, pulling out an exquisite silver whistle from his trouser pocket and running to the window to start blowing it.
"Whew-whew-whew!"
The strange melody spiraled in the night sky, a sound of very high frequency, within the ultrasonic range, audible only faintly to the Abnormal people.
But to Bai Yan's ears, the sound of the whistle was especially clear, and the people of God's Enemy could also obtain this sound through some special means.
This was a special method of communication for the high-ranking members of the God's Enemy organization, designed to prevent anyone from obtaining any intelligence on God's Enemy.
Bai Yan had originally thought that these people would enter through the front door of the mansion, but unexpectedly, Chen Yudong opened the window, and within the darkness, nine figures wrapped in shadows jumped quietly into the room through the window with a few leaps and bounds.
