While driving on a road in Scotland, Yoko barely manages to miss a girl who is absolutely hysterical and being followed by a pack of dogs... The girl, Cecilia, is an orphan who lives in a genuine Scottish castle. Yoko and her friends soon realize that oddities surround the girl. A mysterious castle, ghosts... A whiff of the supernatural floats around the young Scotswoman... Will she be the victim of an odious conspiracy? Intelligent, courageous and pretty, Yoko Tsuno is an electronics engineer. This specialization draws her and her friends Pol and Vic into adventures that cross the line between fantasy and science fiction.