I enjoyed this book which I bought through Whispernet. To tell the truth I was looking for an absorbing distraction read and bought this on spec, not knowing anything of the period or having read anything by Mr Heppner before.
The plot is a mixture of search for redemption (the monk), ill starred romance (the Baron and his woman, the monk and his woman and the berserker and the monks woman) and a military history of the siege of Paris by a humongous army of Danish vikings. It rolls along quite nicely and reflects the conflict between "barbarian" savagery and early medieval Frankish "civilization" (and showing how neither word reflects the people involved completely even at the time.)
Mr Heppner is obviously well studied in his period and many small details are included which help absorb the reader although he does indulge in the author-as-history-teacher trap sometimes when the "voice" of the text explains details in unecessary depth (sometimes, as a reader, it's nice not to have everything on a plate, to have to do a little googling to find out stuff...)
Overall a good and entertaining historical romp. My only major criticism is that the book lacked pre-publication proof reading with several spelling and grammar errors which disrupted the flow of the read. Still, if I had bought this as a full-price paperback I wouldn't have been disappointed.