Missing on Anniversary: Angela Yin was waiting for her husband Xu Tan on their wedding anniversary, but he never showed up. Through positioning, it was discovered that Xu Tan last appeared in an abandoned industrial area. Angela Yin ventured to search, only to find a smashed mobile phone and a conversation between two mysterious people.
Hidden truth: Yin Shaohan found the key and password clues behind the photo frame in Xu Tan's office, opened the hidden safe at home, and found cash, fake passports, pistols and photos of strange women, as well as the mysterious note left by Xu Tan.
Police intervention: Officer Chen investigated the disappearance of Xu Tan. Surveillance showed that Xu Tan left the cafe with his briefcase and got into a suspicious vehicle. Yin Shaohan received a mysterious phone call at the same time, asking her to take the contents of the safe to the old library in exchange for Xu Tan.
Necklace secret: After Yin Shaohan was kidnapped by Officer Chen, she learned that the pearl necklace was the key evidence left by her father. Xu Tan appeared in time to save her, revealing that he was once a member of "Viper" but had betrayed the organization and pretended to be missing to protect her.
The ultimate showdown: With the help of hacker Ye Qing and retired police officer Zhou Yi ("Nightingale"), Angela Yin finds the imprisoned Xu Tan and confronts "Viper" member Lin Yue and police insider Zhao Zhiming, ultimately exposing the entire criminal network.
Concept: suspense