Book is in French It all started with dreams. Cassie has strange nightmares in which a voice calls her from the depths of the ocean. It's disturbing, but upon discovering that Tobias is having the same dreams as her, Cassie decides it's time to listen to this voice calling for help. When debris washes up on shore, covered in alien writing, the friends realize that they may still have allies in this fight to save the planet - allies who are trying to make contact. All they have to do now is find a way to reach them before it's too late.