Cosmic Courier Service trainee Nick Sobolev has only a few days left before his next vacation when he receives the task of delivering valuable cargo to a research base operating in the distant sector of the galaxy. There, in the strictest secrecy, earthly specialists are trying to break into the area of space encapsulated by who knows who and when. For these purposes, engineers are creating the ultra-modern Valkyrie shuttle, which is this valuable cargo. Unaware of this, Nick voluntarily changes the course programmed into the Valkyrie's on-board computer in order to return in time to the beginning of the vacation. A small error leads to the fact that he finds himself inside an unknown star system, cut off from the rest of the Universe by a monstrously curved space. What lies ahead for him? Will he be able to overcome all the challenges on the thorny path home?