Each month Eduardo and his father travel by river from their town to the rainforest. There, using just a basket and a machete, they gather Brazil nuts. They are castañeros and this is how they earn their living.
So although it is difficult work being a castañero, Eduardo looks forward to his visits to the rainforest so he can play with his two friends.
But one night, the peace of the forest is threatened by poachers, animal traffickers who illegally capture and then try to sell some of the birds and animals. Can Eduardo save his friends?