The two mirror worlds are connected by a certain “gap” through which you can get from one world to the other. The worlds are identical, but with one difference: everything that happens in our world now, in “that” world happened 3 years ago. There, a “gap” between the worlds has already been found, but we still have to find it. A three-year head start gives rise to the crazy idea of invading our world in the brain of the adventurer Gross. However, this invasion still needs to be prepared. For this purpose, a group of double criminals penetrates from “that” world into ours. They are confronted by three brave policemen - an Italian, a Frenchman and an Englishman. Will they be able to prevail in a bloody battle with their doubles from a parallel world?