Stalker Likhach finds an unknown artifact in the x18 laboratory. As it turns out later, it does not have the usual properties, but it is difficult to get rid of. The artifact belongs to the category of "parasites" because it can teleport the owner to any point in the zone at any time. This is what happens to the main character. Meanwhile, on the Cordon, stalkers continue to get infected with an unknown virus. Before playing the modification, I recommend familiarizing yourself with the trilogy of mods "Alien Among Aliens" for a clearer understanding of the plot.