Author: Casal Rivas, Paula
- Children/Young
- Hiperión
- ISBN: 9788475178851
- Release Date: 01-01-1970
-Reviewed by: America Reads Spanish

Martina likes to pass the hours on the beach looking for shells or anything else she can find. She likes it so much, in fact, that she doesn’t realize that her family has departed and left her alone on the beach. This is when her adventure begins. A Norwegian scientist helps her and tells her a bunch of stories about whales and the sea. He also gives her a strange tool made from the ear of a blue whale so that our protagonist can discover what it is and how to use it.