Fiction by Jane Green
This novel is about a happily-married woman who meets a new man. He's someone who makes her wonder if she's so very happily married. And she finds herself "tempting fate," with some unexpected results.
It was a good story, although I sometimes wanted to throttle the protagonist and yell at her to make better choices. (You know that watching-a-horror-movie thing where you try to advise the characters: "Don't go check out that noise in the attic. DON'T!!" It's kind of like that.)
But still a fun read.