Gu Jinghui saw the grave look on Gu Shiliu's face and knew he must have discovered something.
It seemed this Doctor Liu really was up to something suspicious.
"What did you find out?"
Gu Shiliu said, "That Liu fellow has been sending messages out using carrier pigeons."
"Did you get to the bottom of it?"
Gu Shiliu replied, "We hadn't found where the pigeons were hidden before. He whistled, and a pigeon flew out. I had men follow the direction the pigeon went."
Gu Jinghui's expression grew even more tense; the whole situation was getting increasingly complicated. Who was Doctor Liu working for?
What was his motive?
Gu Jinghui's sharp, rugged features showed a touch of ferocity as he asked, "What else did you discover?"
Gu Shiliu hesitated before answering, "He moves too expertly—not his first time doing this. These past days, he's probably been communicating outside all along. If he slips up again, we can catch him red-handed."
