The courage of the little trembling

Strange things are happening in the forest where the little aspen and his whole family live.
The elders fear that the Forest Specialists will return to destroy trees as in the past.
The forest had organized a resistance against the forces of evil who wanted to create a perfect species of tree, an aerial race.
The little aspen tree wants to know the history of its forest.
A book to approach the theme of the Holocaust in a metaphorical way.