The wall, with which Abbot Cellach wants to protect his monastery from the attacking Vikings, is to become higher and higher. But he cannot rely on his nephew Brendan, of all people, who is later to become his successor. Because Brendan is much more interested in book painting. Since Brother Aidan came to the Irish monastery, Brendan has only the mysterious book with the golden cover and the wonderful drawings in his head, which Aidan is currently working on...