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The plane is flying at high altitude. A passenger, Wang Qi, insists on making a phone call and suddenly suffers from cerebral edema and dies despite medical efforts to save him. It turns out that the deceased, Wang Qi, was a researcher in a confidential unit who was suspected of stealing secret documents for overseas transactions. The National Security Bureau then dispatches an investigator, disguised as his younger brother "Wang Hao" (played by Sun Honglei), to infiltrate the situation. Meanwhile, Mai Tian is sent to rendezvous with "Wang Hao" with the aim of capturing all the criminals involved...