Hell's Hinges. A Fistful of Daggers

Sophie Keyes has made a mistake that might destroy the universe. The Traveler has an offer: go back in time, fix your mistake, and save the world. Easy. Except that fixing Sophie's mistake means destroying her life, and Lincoln Marshall won't stand to see that happen. Not if he can time travel with them to find another way. Their attempt to jump into the past goes awry and dumps them into Reno 2006, where Elise Kavanagh is in hiding with James Faulkner.
It's a delicate moment in the timeline, and if Lincoln takes a single wrong step, he'll change everything. He can't go to Elise for help. He can't speak to the woman he's loved for years, touch her again, kiss her... Not unless he's willing to bring the universe that much closer to destruction. For the Godslayer, Lincoln might be willing to lose it all. For the Traveler, it might be a step too far.
War is breaking out in Reno 2006, and the consequences threaten to ripple through time--assuming that they don't make the entire world fall apart first. Book 3 of the A Fistful of Daggers series.