The injured sales clerk's and the dead villain's incoming call ring tones sounded one after another. At first listen, they were both perfectly ordinary default tones, but when placed side by side, the differences between them instantly became obvious.
Officer Sato frowned keenly. "Although the pitch is the same, the melody on one of them seems a little slower than the other."
Jiang Xia nodded, then pressed the switch on the tape recorder again.
The tape had already been adjusted to the section where the sales clerk tried to sneak attack the villain but was exposed by the ring tone. The male college student had probably done plenty of intelligence dealing in his daily life; the equipment he had chosen was of good quality, and the recorded ring tone was extremely clear.
"The ring tone on the tape is the same as this phone." Officer Sato pointed at one of the phones. She suddenly understood what Jiang Xia meant. "This really is the villain's phone... so the person who called him was the mole mixed in among the bank employees?"
"That's right." Jiang Xia nodded. "The bank mole was originally waiting for his accomplice to succeed, but he didn't expect someone would actually dare to sneak attack an armed villain. To stop his accomplice from falling for it, he had no choice but to warn him in this hidden way."
"That's outrageous!" The branch manager looked at his subordinates in disbelief. "Who on earth did it?"
Jiang Xia said, "Probably that lobby manager who went to the restroom. If I'm not wrong, he hid in the restroom to delete the call record of the call he made to the villain."
The others: "?!"
Jiang Xia said, "Although he couldn't erase the traces left with the telecom company, as long as