Nobody can turn off the alarm at headquarters. / One of Olive and Otto's cases goes wrong. When the alarm system at headquarters is triggered, Olive, Otto, Ms. O and Oscar must avoid a series of booby ...

Olive and Otto search for Oscar's buried treasure chest. / Ms. O gets a surprise party. In order to save humanity, Olive and Otto must locate a treasure chest that Oscar buried. / The agents throw a ...

Young government agents Olive and Otto use math to investigate strange occurrences in their town. Olive and Otto learn not only how to solve problems but also about working together, communication and ...