The main hero of "Archivist" is Henryk Mikos (Henryk Talar), an employee of the police archives who is above average memory and intelligence, who is trying to solve unexplained criminal cases from years ago. He is partnering with a young, ambitious policeman Zuza (Paulina Galazka).

A retired employee of the police archives, Henryk Mikos, set a point of honor in resolving cases forgiven years ago and putting the culprits in the hands of justice. Henryk analyzed the files for years and ... waited patiently. Due to a coincidence, the ambitious young policewoman Zuza Wasiluk goes to the archive, which Henry considers to be his kingdom. Initially, he considers the old gentleman a freak, but he quickly concludes that it is worth working with him. Henry makes Zuza a secret accomplice in criminal investigations, and when necessary - armed protection. Henryk and Zuza also engage Tomasz Stachure, a police officer who has a crush on her.