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The Secret Club of Supergirls receives an encrypted letter. What is the mystery behind the letter and who sent it? Will the five friends be able to decipher it? The trail leads them to the Horses and Foals riding club.

The girls learn to ride with Franek and get to know the inhabitants of the stable yard: Meka the goat, Silver Lola the travelling cat and her kittens, as well as the beautiful horses Grenada and Figaro. But the children have a special fondness for the old mare Brava. The Secret Club will have to be very clever to find a new home for her.

So get ready: Operation Brava has begun!