A search for 'New Vegas' brings up a load of results for the Fallout game
However, excluding Fallout brought this up, which seems like what you are after
The Heroes of New Vegas
"From
NEW YORK TIMES bestselling author Colleen Gleason, writing as Joss Ware, comes the award-winning paranormal romance series set in a devastated world.
Everything they knew is gone... From the remnants of devastation, five men emerge with extraordinary new powers. They are humankind's last hope, but they cannot survive this devastated world alone.
When Dr. Elliott Drake emerges from a cave after traveling fifty years through time, the world as he knew it is gone. Cities are overgrown jungles, and what's left of civilization has been repressed by crystal-wearing immortal beings. But even more unsettling: Elliott has acquired an extraordinary ability--the power to heal.
But even that gift, in a world that lacks the technology and infrastructure of his past, is a two-edged sword for Elliott.
Jade Kapiza, who'd been imprisoned by the immortal beings, has been in hiding for years. But now she's determined to help the human race fight back against the control of her captors. She can trust no one...but when Elliott comes into her life, he pushes at her defenses and begins to tear down the walls she's built so carefully.
Yet the mysterious doctor seems to have secrets of his own. Can Jade trust Elliott with her heart, even as they risk their lives to save a band of innocents?
And can Elliott find a new place for himself--a home--in this new, ravaged world?"
