The Bavarian Gate (Lion of Farside Book 3)

Curtis Macurdy leads two lives. On earth, he is a farmer; but on the other side of the secret cross-dimensional gate, in the world of Yuulith, he is the invincible mystic warrior, the Lion of Farside. With the war over, Macurdy hopes to return to his life as a farmer. But trouble is growing in Europe as Adolph Hitler rises to power and the Nazis threaten more than the fate of Earth…