Unbreakable Hearts by Em Petrova

He survived the battlefield, but nothing can prepare this military vet for the woman he’d risk it all to keep.

Gabe Thorne is the success story everyone pointed to—the veteran who came home shattered, healed through the Black Heart Ranch therapy program and walked out ready to rebuild. He tried. He really did. But the world outside those mountains doesn’t fit anymore, and he’s called back to the one place that felt like solid ground. What he doesn’t expect is to find a new purpose…and she’s got big blue eyes.
Felicity St. James built her bookshop from nothing—her money, her dreams, her whole heart. Now business is failing and a recent break-in threatens what little she has left. When Gabe steps in to help, his quiet strength steadies her…but the heat simmering between them is impossible to ignore.
With danger escalating, they discover a secret hidden in an old book that could dismantle everything Felicity has left, but Gabe won’t back down from any threat. Standing together means facing down shadows—his, hers, and the ones closing in from all sides. But in the wreckage, something fierce forms between them. Something unbreakable. Something that might be love.