Part 1: The mysterious and most dangerous of the gangsters, decides to judge nothing less than Professor Neurus, in his lair that is under water. Part 2: Hijitus and Oaky try to help Neurus, so that it does not fall back into the hands of the mysterious Granhampa, who hides in an abandoned house. Who is the Granhampa? (Part 3): Beanpole is dressed as a detective and decides to find out who is El Granhampa, accusing Pipo Mancera and as a conclusion he finds an incredible surprise.

Neurus uses Beanpole making him believe that it is Marahá, in a confused legacy of a prince of the East who seeks to recover his throne and his riches.