Grigori: A Royal Dragon Romance. Brothers of Ash and Fire, #1

He's the last heir of a dying dragon bloodline, and she's the mortal woman who could destroy it. Grigori Barinov has one mission: retrieve the stolen manuscript that exposes his family's secret. But the moment he tracks it to a stubborn American scholar with a scent that hits him like fire and storm. he realizes the threat isn't the book. It's her. Because dragons only ache like this for one thing.
A mate. Madelyn Haynes came to Russia for her PhD-and to outrun the humiliation of believing in dragons her whole life. But when a dangerously beautiful stranger sweeps her into his remote estate, the dreams she's had since childhood ignite into something terrifyingly real. He wants her silence. She wants the truth. And the closer they get in the frozen wilderness, the clearer it becomes: She's not just discovering dragons.
She's awakening one. And if she exposes him to the world. she may also shatter the only bond powerful enough to save his dying kind. Beware... reading this book just might start a fire... and dragons are drawn to fire.