The expedition into the heart of the Great Void is launched, and Valerian and Laureline are on it. But in no time they're already facing the mysterious force that threatens the entire galaxy: the Wolochs, gigantic sentient monoliths dead set on destroying any civilisation that might stand in the way of their domination. Our two Human agents can't hope to stop the Order of the Stones by themselves, but fortunately, they still have allies...

London, 1949. One foggy night, Rosie Lane sees her son Brian on the banks of the Thames. Only he died four months earlier; and when she comes near him, he crumbles into dust. An incident strikingly similar to Kathy's own encounter with Gring in Namibia. Pushing on with her investigation, the young British agent will have to contend with bloodcurdling phenomena monstrous insects, accelerated aging as much as the hostility of local Nazi sympathisers.