I need to buy a copy for my Celtic bookshelf. Extremely well researched, and a critical look at the impact of the Northmen/Vikings on the people in British/Celtic lands, beginning with the first raid on Lindisfarne and then Iona and all around the coasts.

I skimmed that last 2/3 of the book, enough to know that this is a good one to refer back to for a different perspective and good historical data.