Rise of Power (The Soulless series)

I'm Samuel Reaper and I'm changing. It started out slowly, a dream now and then about some lady in white telling me to fight dark creatures. But it became bigger, a series of seizures in the night that made me tall or short on a whim. I became unproportioned and horribly prone to tripping over nothing. All this stuff I can deal with, but learning I'm not just your average 13 year old boy, but a member of the seven Soulless, a group of people devoted to the greek goddess Psyche (who are spread all over the ancient relms, no less) and a double seven... now that's a little hard to swallow.