Six Years by Harlan Coben

Six years ago political science professor Jake Fisher watched the love of his life, Natalie, marry someone else.  Natalie made Jake promise then that he would leave her alone--and he has.  But when he sees an obituary with a photo that resembles Natalie's husband, Todd, he decides to go to the funeral.  He is stunned when he meets the dead man's family and his wife is not Natalie, but another woman.  Jake realizes that he is not going to be able to keep his promise to Natalie and vows to get to the bottom of what happened to her, despite the cost.  In Six Years, Coben has written a page turner that's extremely hard to put down.  It's wonderful that he's able to come up with a story so compelling after all these years of writing thrillers.  It will be published next month.