The series “Girl Detective Agatha Mystery.”

Endowed with amazing instincts and a phenomenal memory, Agatha Mystery dreams of becoming a writer. But that’s in the future, but for now she’s just an excellent detective! Together with her hapless cousin Larry, a detective school student, she travels the world to solve the most perplexing mysteries. And they are helped by a devoted butler, a mischievous Siberian cat and many eccentric relatives.

Dangerous Cruise Agatha and Larry Mystery are relaxing on board the transatlantic liner "King Arthur". But the underworld doesn't know what a vacation is! Agatha and her friends find themselves unwitting witnesses to a real spy drama. Young detectives will have to solve a terrible murder and neutralize a dangerous criminal in a matter of hours until the liner arrives in the Norwegian port of Trondheim. If only Samuel Mystery, Larry's father, hadn't interfered with the investigation!..