Beowulf's Children by Larry Niven, Jerry Pournelle, Steven Barnes (Heorot #2) | Vintage Science Fiction

Used; Paperback - Excellent; 1st edition, 1st printing; some minor spine wrinkling, spine a little cocked. 

A new generation is growing up on the island paradise of Camelot, ignorant of the Great Grendel Wars fought when their parents and grandparents first arrived from Earth. Setting out for the mainland, this group of young rebels feels ready to fight any grendels that get in their way. On Avalon, however, there are monsters which dwarf the ones their parents fought, and as the group will soon learn, monsters also dwell in the human heart.