Oathsworn Ser.: The Prow Beast by Robert Low (2010, Hardcover)

The Oathsworn have become feared and respected throughout the Viking world. Their name goes before them and men cower in their presence, but they soon discover that fame comes at a price. While the Oathsworn revel in their newfound glory, Sterki, an old enemy with revenge in his heart, attacks their homestead—the Fjord Elk is sunk, old oar mates die, and the Oathsworn are forced to flee into the mountains. Unaccustomed to losing, the men retreat to lick their wounds. They have been entrusted with the care of Queen Sigrith, pregnant and soon to bear the heir to the crown of Sweden, and though the urge for revenge is strong, Orm's first duty is to protect the queen. He soon realizes that revenge is not the only thing on Sterki's mind; he has joined forces with Styrbjorn, nephew of King Eirik and next in line to the throne—if he can only get rid of the current heir. As the Oathsworn fight to defend themselves and their newfound celebrity and fortune, they're soon to realize that fame isn't all it's cracked up to be.