The Viennese detective children Biggi, Patrick and Luke find a key in dragon form, and their curiosity is aroused. They realize that the sinister Lady Q is interested in opening the legendary moon palace and find the elixir which is believed that promises eternal youth. The Tigers must prevent that Lady Q enters into possession of the priceless liquid.
Kingdom of Hungary, 17th century. As she gets older, powerful Countess Erzsébet Báthory (1560-1614), blinded by the passion that she feels for a younger man, succumbs to the mad delusion that blood will keep her young and beautiful forever.
