The Longest Fall. The Long Exile, #1

He spent two thousand years making himself invisible. She spent fourteen months finding him anyway. Sariel has survived his exile by becoming Eli Warde - a private collector, a careful man, someone history slides past without catching. He is very good at this. He has had to be. Callie Renaud is a documentary filmmaker who finds things people have spent centuries hiding. When her research leads her to a man whose face appears in the historical record across two millennia, she expects evasion.
What she doesn't expect is the way something goes still in him the moment she says her name - as if he recognizes her, though they have never met. He knows why. She is the living echo of the woman who destroyed him. As Callie follows the thread deeper and Sariel finds himself unable to do what he should - contain her, neutralize the research, let her go - the exile that has defined two thousand years of his existence is finally ending.
Heaven is calling him home. The choice should be simple. It isn't. Because somewhere between her relentless attention and his crumbling walls, something neither of them planned has taken hold. And now Sariel must choose between the immortal existence he was always meant to return to, and a mortal woman who has managed, without trying, to become the only thing that feels like home. The Longest Fall is a slow-burn paranormal romance about the weight of two thousand years, the danger of being truly seen, and the cost of choosing to stay.
Book One of The Long Exile series.