Silent Setup by Katie Mettner

He can only protect them if he harnesses the lessons of his past.

A special ops mission gone wrong has left Eric Newman deaf, grappling with PTSD and shouldering the burden of unresolved guilt. Nevertheless, he’s building a new career and a new sense of purpose as a security expert. Then Sadie Cook and her baby nephew come crashing into his life. Even before he knows that he’s falling for Sadie, he’s determined to do whatever it takes to keep her and the little boy safe. But painful memories keep invading, making him wonder if he’s the right man to protect them...