Roads to Moscow Series by David Wingrove

The War For Time Continues.From the frozen tundra of 13th Century Russia to the battle of Paltava in 1709 and beyond, Otto Behr has waged an unquestioning, unending war across time for his people.But now a third unidentified power has joined the game across the ocean of time, and everything Otto holds dear could be unmade...

Part Three of The Roads to MoscowThe war for time is reaching its endAs the German and Russian forces seek to destroy a third, seemingly unstoppable faction, Otto Behr reluctantly finds himself at the centre of all timelines, his very existence the catalyst by which reality itself will be reset or destroyed.But for Otto, the battle to become the Master of Time has become a fight for family, love and reality itself...