Brian and Paul had no choice but to join the tracking as well, because even if Yang Yi and Anton took turns at surveillance, there was a considerable risk of being detected.
Five people, four vehicles, and after two vehicle changes, they at last managed to tail Park Ji-yi to the exterior of an innocuous-looking house.
Park Ji-yi drove into the house, while Yang Yi and the others immediately spread out to commence the final stage.
Just tracking was meaningless, the crux was to know who Park Ji-yi was meeting and what was being said.
Yang Yi and Xiao Ran set up a microwave eavesdropping device, while Brian and Paul were operating a laser surveillance device.
Sound waves could create a faint resonance effect on glass or metal objects, which in turn could reflect microwaves. Yang Yi controlled a directional microwave emitter aimed at the windowpane; if there was speaking inside, the device could capture and reconstruct the content of the conversation.
