On his educational journey through space, the aspiring navigator Mayï stops off at a remote outpost of the community: the base. Here he follows in his father's footsteps, becomes acquainted with the culture of the Marshlands and makes new friends. The challenges he faces this time will push him to his limits. He must take on a creature that threatens the entire galaxy. And an old enemy has prepared a perfidious trap for him. Mayï's abilities are put to the test. But he will not give in so easily.