The sixth book in the “Coptic Cross” series. New adventures of heroes familiar to readers from the previous books in the series. The portals connecting the twenty-first century with the nineteenth were never restored, but chrono-travelers still managed to return to the past, touching the secret along the way - the real, genuine secret hidden in the interweaving of “wormholes”. And even this fleeting touch almost ended in tragedy for them... But there is no time to solve it, our heroes face a mortal battle with the remnants of a gang of radical terrorists. It turns out that behind these scoundrels there are other forces, much more powerful and dangerous. To counter them, the head of the Department of Special Projects, Baron Korff, accompanied by a guest from the future, goes to France, where the next act of this intricate drama is to take place.