Jerry Pournelle and Larry Niven present a sound scientific background and superb, fast paced storytelling, as in their prior colaborations. Steven Barnes does a good job in characterization, which was one of the minor weak points of the two aforementioned authors.
The Story :
The planet AVALON gets settled by a mixed group: scientists, farmers, administrators and so on. The settlement is placed on an island before the coast of the main continent to hinder biologic intoxication with earthbound genematerial.
The island seems perfectly save, but one day comes GRENDEL :
An organism with capability of hyperfast movements.
A former soldier is the hero of the story, he kills the monster, but only after it has the violated the settler's camp and killed many people. Typically the survivors blame the soldier for the killings and so he finds himself another place on the island to build his home, alone.
The scientists of AVALON do research on GRENDEL's cadaver for an explantation for GRENDEL's abilities but only when they answer the most important question :
Where does GRENDEL come from ?
the book unfolds its true action.
I recommend this book and also its sequel 'The Dragons of Heorot'.
Buy them.