MEI LI SUN works illegally as a waitress in a dive bar in London’s Chinatown until one day, despite her strong survival instincts, she can’t prevent her father from being slain by the ruthless Snakeheads gang. Since the Snakeheads are responsible for smuggling the two of them into the country, she is now indebted to them for both her transportation fee and her deceased father’s. Mei Li is also worrying herself sick about her younger sister, who has vanished while boarding with them for England in the flow of stowaways.
With a debt she cannot pay hanging over her, rent due to her lodgers, the disappearance of her sister, and the grief of her father’s brutal murder, Mei Li is at a loss. When ALEX RHYS, an MI5 officer, approaches her with a job offer, promises to repay her debts, and gives her a UK passport, Mei Li accepts. Alex and the MI5 begin training her to mimic the voice and movements of an unknown woman and help her enhance her skills of observation and impersonation. Once her training is nearly complete, she discovers that she has been training to impersonate ANNA HUANG, the mistress of JAMES WU, head of the Wo Shing Wo Triad, the archenemies of the Snakeheads.
The MI5’s strategy is to divide and rule the Triads. So Alex poses as a Russian thug who wishes to weaken Mr. Wu’s hold on the sex trade in Russia by using the Snakeheads to hit him in London. Carrying out his plan- Alex teams up with the Snakeheads’ boss, kidnaps Anna Huang and dictates to him to keep her for two weeks without asking for a ransom. The assumed goal is that when Mr. Wu discovers his mistress is missing, he’ll be so upset that he’ll give in to whatever demands by the end of the 14 days.
Meanwhile, Mei Li has been sent into Mr. Wu’s lair to take Anna’s place in a high-stakes performance that could end at any minute if she makes one tiny mistake. At first, Mr. Wu is fooled. As Mei Li carries out Anna’s usual sordid tasks, like managing child prostitutes from China, she falls under Mr. Wu’s spell and mistakes his power over her for protection. Despite Alex’s firm attempts to pull her out, she becomes Mr. Wu’s mistress and puts the whole mission at risk.
This is when Mr. Wu becomes suspicious about Mei Li. He puts her to the test, charging her to kill a young prostitute who reminds her of her sister. Mei Li snaps out of it and saves the girl’s life. Meanwhile, Anna manages to break out of her cell by seducing her guard and stabbing him with his belt prong. At Mr. Wu’s house, Mei Li searches for his notebook, the last crucial piece of evidence she needs to put him away. She stops when he comes home, soon followed by Anna, highly stunned to find herself face to face with her dead ringer! Baffled, Mr. Wu has the two women tortured and questioned to identify the impostor. While the Snakeheads gang storms in to “negotiate” after Anna’s escape and a battle ensues, the only way out for Mei Li amid the all-out gang war is to team up with the woman whose identity she stole. Once Mei Li has managed to contact the MI5, Alex and reinforcements raid Mr. Wu’s residence. Just in time to stop Mr. Wu from strangling Mei Li.
The mission is a success. Mei Li has earned a British citizenship and a new assignment. Along with Alex, she will start a joint operation with Hong Kong’s Vice Division to stop Mr. Wu’s child trafficking. Since she has also been informed that her younger sister is alive in Hong Kong, Mei Li now views her near future as focused and hopeful.
