Marc Trena, private detective, has to investigate a delicate case: in a luxury hotel for animals has disappeared one of the most important customers: the famous hippopotamus writer. The director of the hotel has received a parcel with the ear of the...

Marc Trena, private detective, has to investigate a delicate case: in a luxury hotel for animals has disappeared one of the most important customers: the famous hippopotamus writer. The director of the hotel has received a parcel with the ear of the hippopotamus inside and he does not want that neither the police nor the press are informed about it. Marc Trena will have to be in touch with gorilla-thugs, waiters of not very nice bars and unpleasant secretaries while avoid the police. But anything can make him loose his tough smile.