Au Royaume des Cieux takes place in in a dreadful girls' reformatory. A couple of lovers will try to escape from this living hell.
An inventor has just developed an extraordinary machine, a disintegrating ray and thought detector. He experiences it one evening on a group of relatives, including his fiancée, and it seems to turn into a tragedy: he is found lifeless, apparently poisoned. A man calling himself a police officer begins to investigate.