Là, tu m'vois plus - Avec ou sans moustache

One of Oscar's Oscarobots has malfunctioned and caused chaos at headquarters. In addition, Agent Ori's first day on the job is a disaster; the other OSI agents take the opportunity to tell him about their first days as their worst experience as well.

Olive infiltrates a high-stakes game of 'rock, paper, scissors' criminals.

In the middle of summer, Olive and Otto must find out why it is cold and snowing in certain areas of the city. Afterwards, Olive and Otto interview two suspects to find out who is innocent and who is guilty.

The ball pool begins to overflow and the entire OSI staff must prevent the headquarters from being destroyed. In addition, two of Mrs. O's assistants accidentally find themselves in charge of an important mission.

Olive is accused of having committed a serious and unusual crime. Otto defends her at her trial.

Oscar tells Olive how he got his start at OSI. Also, Olive and Otto get stuck in a board game.

Headquarters is affected by a power outage. The OSI must find a way to keep dragon eggs at the right temperature. Afterwards, OSI conducts an exciting investigation at the city library where books have mysteriously started to fly.

Now Olive and Otto find themselves trapped in a comic book. Olive has to find a way to escape using the story of the comic book, which she knows very well.

Olive and Otto face the biggest challenge of their careers.