1950 年代香港，Returning scholar Cali Dan Yang immersed himself in national defense research work upon his return to China. Upon arrival, he found himself ensnared in a dangerous web orchestrated by an international crime syndicate. Police officer Pong Hong Mei safeguarded Cali's safety and facilitated his return home. Despite the syndicate's failure in Hong Kong, they continued to sabotage a crucial project known as "Water Drops" stationed at Lugou Bridge. This led to the deployment of "Stone Plan," masterminded by the syndicate's notorious agent, "Snow Wolf." Their objective was to disrupt China's scientific endeavors. As critical junctures in the Water Drops project approached, the syndicate always managed to take the lead in sabotage efforts. With Snow Wolf remaining elusive, the syndicate continued its covert attacks on the Water Drops project, pushing Pong Hong Mei and her fellow officers into a high-stakes battle against this formidable adversary. In the end, they engaged in a life-or-death struggle at Lugou Bridge....
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