An unknown danger is approaching inhabited worlds from the center of the Galaxy. In some places, the activity of luminaries suddenly increases sharply, people disappear in strange ways, inexplicable incidents occur, but the interstellar community does not yet believe in the reality of the threat.

A few brave souls, such as the Dactian Cyrus Rem, have to stand up to defend their worlds. Smugler Hornet and the Maromans Max Hauer and Dr. Boris Bose. They forgot about enmity and became one team after in the sector of the planet Terranova they encountered the first signs of an impending general disaster and its herald, the ship "Steel Butterfly".

To learn as much as possible about the enemy, Hauer , Rem and the team go to the free planet Enium, the main information crossroads of the inhabited part of the Galaxy. How could they know that the enemy was watching them and that with their visit they were exposing Enium to attack?..