The Edge of Us by Jamie McGuire

Widowed before thirty, Naomi Abrams has been through a lot. Her husband Matt sacrificed his life to save his Marine brothers. Daughter of the US modern militia’s founder, heartbroken Naomi joins the Marines in Matt’s place, too-ready to do anything to help protect his team—men who are like brothers to her now. Retiring together to the town of Colorado Springs, they’ve assembled to take on the job of security at the top-secret military base, the Cheyenne Mountain Complex. As they struggle to adjust to their civilian lives, they also discover new dangers.

Zeke Lund has been alone since being bumped out of the foster system at age eighteen, and now his rag-tag family consists of his hotshot brothers and sisters. Shattered by his first love, Zeke never planned to fall for someone again, especially not during fire season in the Colorado mountains, but Naomi is unlike anyone he’s ever met. She’s strong, stubborn, and takes exactly zero crap from anyone. At the top of a freezing canyon, the fire glowing down below, Zeke finally admits he may have feelings for the widow with the foul mouth and broken soul. When his health begins to fail, he wonders if he should love her enough to let her go or let her fight with him—with the real possibility of burying another man she loves.

Despite hurt, pain, fires, and illness, two strong people with fragile hearts struggle to beat the odds… and their love might just be strong enough to survive it all.