There are 5 books in the The Oathsworn Series series. The newest book is Crowbone which came out in 2012.

The first in a brand new series charting the adventures of the Oathsworn, a band of Vikings on the chase for the secret hoard of Attila the Hun.

Life is savage aboard a Viking raider. When young Orm Rurikson is plucked from the snows of Norway to join his estranged…

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2
The Wolf Sea

Book cover of The Wolf Sea

The gripping second novel in the Oathsworn series, charting the adventures of a band of Vikings looking for the return of the Rune Sword that will lead them to Attila's Hoard

A band of brothers, known as the Oathsworn, committed only to each other and feared by many, rises again,…

3
The White Raven

Book cover of The White Raven
The epic and action packed sequel to The Wolf Sea, charting the adventures of Orm and his band of Viking brothers, The Oathsworn The Oathsworn have itchy feet. Battle-hungry and tired of keeping the homestead fires burning, they are restless for action. And, being the Oathsworn, action is what they…

4
The Prow Beast

Book cover of The Prow Beast
The epic and action packed sequel to THE WHITE RAVEN, charting the adventures of Orm and his band of brothers, the Oathsworn. The Oathsworn have become feared and respected throughout the Viking world. Their name goes before them and men cower in their presence. But fame comes at a price!…

5
Crowbone

Book cover of Crowbone
The long awaited return to Robert Low's Oathsworn series Island of Mann, 979AD. A man lies dying with a message he cannot take to his grave, a sworn secret that must be passed on only to Olaf Tryggvasson, kin of Harald Fairhair of the Yngling line and true prince of…