Das Haus des Magiers. Die Tür im Baum

The dark side of the moon

The door in the tree

The Buddha way

Now and then

Two gentlemen sharing

The Tunnel Behind The Waterfall

The Bridge in the Clouds (The Magician's House, Book 4) (Magician's House Quartet)

The Door in the Tree (The Magician's House, Book 2) (Magician's House Quartet)

Tunnel Behind the Waterfall (The Magician's House, Book 3) (Magician's House Quartet)

The Steps Up the Chimney (The Magician's House, Book 1) (Magician's House Quartet)