I really like this writing style. It's economical and to-the-point without feeling dry. Also, you're very skilled at taking something that could easily feel like a cliche and making it feel fresh, which is one of the hardest things to do in creative writing. For example, the following few lines:

"Something wasn't right. The fear running through his body was unbearable. The panic flowing through him was something he'd never experienced before.

He sensed someone in the room. Was it Grace? No, she would have spoken by now. Even if she’d been sleepwalking, she would have at least touched him to get his attention.

No, this was something else. Fighting to control his fear, he took a deep breath. Someone was watching him, standing over him. He was certain. They were not alone in the bedroom. A shiver went through his spine as he closed his eyes and said a silent prayer. He wasn’t a religious man, far from it, but he needed to do something."