Smoke and Mirrors by Elizabeth Silver

Two things I know for sure: Magic isn’t real and never date your coworkers.

Xander knows for a fact magic belongs solely in the realm of fiction. But fate has other plans when he finds himself reluctantly going on a date to a mysterious traveling carnival. Little does he know that this seemingly harmless outing will thrust him into an entirely different dimension, where magic is very much a reality—though its practitioners label it as science.
As Xander navigates this extraordinary new world, he finds himself accompanied by distractingly attractive government agent Justus Farhill, whose good looks and honest heart make it challenging to keep those pesky emotions in check. Their undeniable chemistry grows the more they work together, and even though he knows he should be fighting to find his way home, Xander instead finds himself with one heck of a reason to stay.
But amidst the blossoming romance, the veil of tranquility over this strange realm has begun to fracture. A cataclysmic battle decades in the making looms on the horizon, where the balance of power between science and magic threatens the very fabric of existence if the wrong side gains control.
As alliances shift and loyalties are tested, Xander finds himself questioning what’s real… and what’s really worth fighting for. With the fate of multiple dimensions at stake, both Xander and Justus must confront doubts and insecurities about themselves and where they belong.

Even if that means sacrificing everything in the end.