After each call, she would take a deep breath and try to relieve herself from the stress for a moment.

Late one night, Tong Xiaoge sat at her desk, the light softly illuminating her resolute face.

She had just finished a call with an informant who claimed to have key clues about the source of the package.

The voice on the phone was low and mysterious, and Tong Xiaoge felt both expectant and alert.

After hanging up the phone, she left a line of notes, scribbling ...