A collection of essays on Beowulf and, more generally, Old English, Old Icelandic, and even the later Anglo-Norman literatures -- what survives, anyway. I wasn't too impressed. I only glanced at most of them, I only read the one on Tolkien fully, but they're not great in depth. I did like the examination of Unferth's development into Wormtongue.
It's more light reading for people who're interested in a bit of background of these literatures than anything worth using for a thesis or whatever, I think. Certainly as far as Tolkien's concerned, anyway.
Oh, and in case anyone's confused, some people have been reviewing this book as a translation of Beowulf. It isn't, although it contains some excerpts where relevant.