Color me amazed. A competently written "Kindle First" freebie. 
 Chalk this one up as a "tense thriller" with chicklit roots. It's basically Rachel-Caine-does-C-J-Box. And honestly, it's not bad. It's the kind of book you'd find left behind at a hotel, read, enjoy, leave at the airport, and never think about again. Think "Hallmark mystery movie of the week". 
 So there's a heroine. She tries to start a new life after a chilling life experience. But her past haunts her. An impossibly attractive man moves in next door. Can she trust him? Should she? There's a big climax sequence as she and her kids are on the run for their lives. There's a happy ending but with a hook for a sequel. 
 Since my review is simply a collection of pat metaphors, this is fantasy author Rachel Caine's attempt to pull a Robert Gilbraith, except JK Rowling did it first and a whole lot better.