Transgression: City of God, Book 1 by R.S. Ingermanson
Summary: What if you were studying for your Ph.D. in archaeology and decided to take a break from your crummy life by working on an archaeological dig in Israel?
What if you met a great guy in Jerusalem who happened to be a world-famous theoretical physicist working on a crazy idea to build a wormhole that might make time-travel possible … someday?
What if he had a nutball colleague who turned the theory into reality — and then decided to use YOU as a guinea pig to make sure it was safe?
What if the nutball had a gun and went on a crazy, impossible mission to hunt down and kill the apostle Paul?
It’s A.D. 57 when Rivka Meyers walks out of the wormhole into a world she’s only studied in books. Ancient Jerusalem is awesome! Rivka can’t believe her friend Ari Kazan’s theory actually worked. But when she runs into Ari’s whacko colleague, Damien West, in the Temple, Rivka starts to smell a rat.
When Ari discovers that Damien and Rivka have gone through a wormhole that’s on the edge of collapse, he has to make a horrible choice: Follow them and risk never coming back — or lose the woman of his dreams forever.