The cruiser “Impeccable” has returned from the first interstellar flight in human history. It turns out that all the astronauts on board died in terrible and mysterious accidents. John Hellard, an expert from the corporation that created the Impeccable, is trying to investigate the incident. Isn't the unknown monster that destroyed the interstellar expedition still hiding on board the landed cruiser, just waiting for the moment to break out into the human world through the triple cordons sanitaires? However, someone is constantly interfering with Hellard’s investigation: the military, developing new types of weapons, became interested in the incident with the “Impeccable”...