Can you imagine a planet made entirely of water? They named her Drop. Located at the intersection of important space routes, the Drop became a place where the interests of the Earth Federation, the Union and the League of Free Worlds clashed. Humanity, spread throughout the Galaxy, never became united. Military confrontation, economic turmoil, the problem of contact with alien life - all these contradictions dividing the world haunt flyart pilot Alexander Shaban, who first ends up on the less than prosperous planet Procne, then on the Drop. And then it turns out that there is a certain mysterious Halo...