January 1, 2023. Giorgio De Giorgi stands in front of the mirror, contemplating his first 40 years of life. He works as a chef in a restaurant in Turin and has a desire to tell his story. He decides to buy what will become his life diary. He finds a "vintage" diary online that turns out to be something truly special. Through its pages, he will meet Joel Ferrél, who is also "trapped" in the diary, and together, they will face different adventures each day to uncover the culprits of various murders or thefts. Giorgio will also find love in a girl from Chivasso, Lucrezia Ferrante, whom he meets by chance while hitchhiking. The two begin dating within days, but the diary's choices are very different from reality. Suddenly, Giorgio is no longer a chef but officially becomes a world-renowned detective. This success completely overturns his life. No one remembers what he was for forty years. Lucrezia remembers nothing of their history and asks to become the secretary of DE GIORGI & FERREL INVESTIGATIONS. Other days of activities between the present and the past will lead Giorgio to discover things he never imagined. His relationship with Lucrezia no longer exists, and he accidentally finds out that Joel is currently dating the woman he loved. After some clarifications, Giorgio and Joel make peace, but another problem presents itself before their eyes. Joel knows that his time is running out, but he lacks the courage to tell Giorgio. The diary has other plans for him. Everything will come to light on January 31, when Giorgio's life will be turned upside down once again.