This isn't a deep read with a lot of twists, and that's just fine.
Luke is a businessman (software, I think) who is still trying to recover from a tragic loss when he meets Ashley. She's everything he didn't know he needed, and when he discovers that she is not impressed by his wealth and status he finds new freedom in her and her daughter than he ever had before.
Unexpected events being Ashley to the spotlight of news and social media, something she's always avoided. When she turns up suddenly missing, Luke will move heaven and earth to bring his wife and step daughter home. However, the more he uncovers in his search, the more danger tightens it's grip on him and leaves him fearing for his family's safety and wondering if he will ever see them again.
Exciting read, well-written even if it's not twisty, likeable characters, and very few plot points that stretch disbelief beyond it's limits. I'll probably read more from this author.