This book is available in the following languages.
Jupiter lives with his father, a scientist for supernatural phenomena, in a ruined castle. With his cousins Vicky and Nick, he has started the Horror Club. The three experience all manner of scariness with you, but at the end they always get to the bottom of the phenomena. A time gate also allows you to travel back in time and prevent events which would have changed world history.
Horror stories – 10 years and up
22 volumes, 4 volumes "Time Hopper", 1 special edition and 5 omnibus volumes (SchneiderBuch), currently translated into 6 languages