There is a girl locked up in a strange place. It seems that she has no escape: the closest thing to an ally is the squirrel that has sneaked into the little room where she is held captive. She remains calm and begins to remember, little by little, what she learned, inside and outside school, about simple machines, forces…, in short, science. She will have to demonstrate her knowledge in a real-life exam that will not be easy.

Mystery novel that shows a practical side to the not easily accessible basic sciences.