Helios, a most wanted criminal in the global radar, has stolen the South Korean military’s latest mass destruction weapon: a handheld nuclear device DC8 and 16 uranium spheres. An underground trading of the stolen weapon is due to take place in Hong Kong. Chinese envoy Song An, Hong Kong’s Counter Terrorism Response Unit Chief Inspector Lee Yin-ming and South Korean weapon expert Choi Min Ho are all gathered in Hong Kong on a mission to recover the weapon. Physics professor Siu Chi-yan joins the team as consultant. Beneath the shared goal of recovering the weapon, the three regions’ representatives are all armed with hidden agendas. Choi not only has to capture Helios and recover the weapon but needs to prevent the leaking of national classified information. Song has China’s interests in mind. And on top of resolving the unit’s biggest crisis since its conception, Lee and Siu have to grapple with the tension between the two countries. Although the Hong Kong police manage to capture Helios’s assistant and recover the weapon, a diplomatic dispute between China and South Korea on who owns the confiscated nuclear device is unleashed. Meanwhile, Helios pops up in Macau, determined to reclaim the weapon and avenge his earlier defeat. In the final showdown, no one is safe from the danger and conspiracies that lurk underneath.