Shao Tianyu was once a top security analyst, but he was framed by his best friend Lin Hongyuan and lost his career and reputation overnight. Now he takes his five-year-old daughter Xiaokui alone, opens a mystery bookstore in the corner of the city, and lives the life of an ordinary dad. His "absolute logic" golden finger can instantly discern contradictions and hidden connections in any information, but now he only uses it to tell bedtime stories to his daughter.
During a parent-child activity in a kindergarten, a video accidentally shot by Xiaokui suddenly activated Shao Tianyu's intuition - the conversation of a strange man in the background contained logical loopholes that even the police ignored, and it perfectly matched the key evidence of an unsolved case three years ago. And that unsolved case was the doubtful point of the project that Lin Hongyuan was responsible for back then.
In order to protect his daughter and uncover the buried truth, Shao Tianyu had to return to his old career. However, the closer he got to the truth, the more he discovered that behind it all, there was a shocking secret about his daughter's life experience.
