Poul Anderson's stunningly powerful Norse dark fantasy.

Poul Anderson was born in Pennsylvania of Scandinavian stock. He started publishing science fiction in 1947 and became one the great figures in the genre, serving as President of the Science Fiction Writers of America, winning multiple HUGO and NEBULA AWARDs, and was named a SFWA GRAND MASTER. He collaborated regularly with wife, Karen, and their daughter is married to noted SF writer Greg Bear. Poul Anderson died in July 2001.