As a result of a bloody battle that left few survivors in the 22nd cavalry, Sergeant Chesterfield completely lost consciousness. Deaf, mute, empty-eyed, sitting without moving on a wheelchair, he does not seem more alive than a courgette. To such an extent that the high command is thinking of getting rid of it. But what could he do in such a state? Corporal Blutch, loyal comrade, takes his defence to the staff and obtains a white card to try to bring back to life his superior. He has thirty days, not one more, to try desperately and by all means to get the sergeant to react.