The Anubis Gates
An old, rich eccentric discovers certain portals in which it is possible to time jump.
Takes a group back, one gets left behind, his story. Ends up fighting a bunch of crazy egyptians who want to change history so that Egypt rises again, while doing this he becomes a little known[in the future] poet.
I had read this in highschool, so had a vague rememberance of what was going to happen, but it was still a nice surprise overall. Very enjoyable.