Dissonance (Dissonance #1)

In an alternate world where Earth is populated with powerful human-spirit hybrids called Fantasmen, Folke and Roisia Herviett, two siblings with opposing worldviews, are challenged to prove their worth and take up their parents’ positions in a devious group who secretly run the world. Meanwhile, Seraphim, a Fantasmen warrior guard, is sent to prevent a catastrophic event from affecting the Earth and its own universe.