Having recently read Beowulf for the first time, I was looking forward to this slim novel, told from Grendel's point of view. Poor Grendel, although we never find out exactly how he was created, he does realise that he has a bit of man in him somewhere, and he agonises over this as he lurks around watching men and occasionally getting the urge to kill one - always to eat at this stage. It is his encounter with the arrogant Unferth, that starts to really turn him and this is sped on by the dragon's wisdom until he becomes the killing machine we know from the original text.
The very dense and literary style with much philosophising will not suit all, but it has great insight and goes very well with Beowulf indeed. A difficult but rewarding read.