Reunification — Timothy L. Cerepaka

Book One in the Two Worlds series When one knight travels to a another world to find his long-lost sister, he is drawn into a conflict deeper than he knows. With three photographs of his sister as his only clues, Rii, a Knight of Se-Dela, travels to Xeeo, a world of science and technology completely unlike his magical and mystical home world of Dela, where he hopes to reunite with his sister after her mysterious disappearance six years ago. It soon turns out that the disappearance of Rii's sister is linked to a vaster conflict between two ancient organizations that stretches back to the dawn of the two worlds themselves. And when Rii finds himself stranded on this world, he must race to find his sister before the mysterious figures who want him dead end his life.