Nightlord: Penumbra

Eric is a physicist, an angel vivisectionist, and an architect of the future. He's also an accidental time traveler, stuck in the past and trying to re-create his own future. Now he's got to save the world for a better tomorrow, but not like everyone does, in general, every day. Oh, no. He has to make a better tomorrow that looks exactly the way he remembers it, or there may be no yesterday, no today, and no Eric! There is a reason he hates time travel, and it has nothing to do with physics. Nightlord: Penumbra is the eighth book in the Nightlord series.