Night Watch by Suzanne Brockmann

When U.S. Navy SEAL chief Wes Skelly was sent to L.A. on assignment, he agreed to go on a blind date with beautiful single mother Brittany Evans, sister–in–law of a fellow SEAL. After all, he had been secretly in love for years, albeit with a woman who belonged to another man. So what did he have to lose?

Plenty, it turned out. Because suddenly the woman he'd thought he could never have was available. However, so was Brittany and not only that, she was in danger. Because of him. He knew he could keep her safe. But why was he increasingly certain that he was the one in danger?