Yesterday's News by RG Belsky

 Lucy left for school one day--and vanished off the face of the earth. Years pass but neither she nor her body ever turns up. Clare is a reporter who won a Pulitzer for her reporting on the original disappearance. Now, years later, it comes to her attention that an email has appeared with a possible new lead. And she gets drawn back into the story.

This was a good twisty mystery. Everyone seems to have a lot of secrets. And it's impossible to know who's telling the truth. There are also several people who seem to have a fluid sense of ethics, so it's hard to know how much their words can be trusted. Lots of surprises till the very end.