Hong Kong international police officer Yeung Lai-ching (played by Yeung Lai-ching) went to the United States to investigate a drug trafficking case in Seattle with the local narcotics team leader Dong Ni (played by Donnie Yen). When they tracked down a local Chinese suspect Liu Zai (played by Yuan Richu), they had already received news that Liu Zai had sneaked back to Hong Kong, so Yeung Lai-ching and Dong Ni returned to Hong Kong together. During the pursuit, they found that Liu Zai was constantly being chased and almost died several times. Dong Ni began to think that Liu Zai was definitely not just involved in this drug trafficking case. When Dong Ni and Yeung Lai-ching kept tracking it down, they found that the whole thing was actually related to the US Central Intelligence Agency, and Dong Ni’s colleague, the leader of another group, Michael (played by Michael Wong), was also involved. The truth of the incident was really peeled off layer by layer.