International terrorist organization abducted many children, turning them into spies to work at various police forces around the world. After Superintendent Yip (Francis Ng) and Inspector Ching (Nick Cheung) arrested a female hacker named Yiu (Jiang Pei yao) who was about to piece together the schemes of the organization, Superintendent Cheng (Louis Koo) tried to take the case off their hands. Who could be the double agents? They went to the exotic Myanmar and Spain to find out the truth, but soon there are blurred lines between good cops vs bad cops.