From the back of the book
In the shadow of Yggdrasill lies more than just the world of men. From the realm of the Gods to the dark domain of Hel, nine worlds stretch out across her roots and branches. Those who travel beyond the world of men had best be prepared. Dragons and Giants await; and neither the Gods or the Draugr take kindly to uninvited guests.
The Nine Worlds takes you on a tour of the realms beyond mortal men. Each world is given a detailed description, including the creatures and Gods that make it their home, allowing you to take your sagas to new and fantastical lands. The supplement also contains three new adventures and a host of additional material for your games.
The English language translation of the original French book includes material that was originally in the French GM-Screen booklet, not the French book.