The long hunt : Book 4 of the Strongbow saga series

"The victorious Viking army has returned to Denmark from Frankia, after capturing Paris and extracting an enormous ransom from the Franks in exchange for leaving their kingdom in peace. Now Halfdan, with the aid of Jarl Hastein and his warriors, is ready to bring Toke, the chieftain who murdered Halfdan's brother Harald, to justice. The Strongbow Saga is an epic tale of one man's unstoppable quest for justice and vengeance that carries him across the 9th century world of the Vikings....