Before She Disappeared by Lisa Gardner

A gripping thriller featuring an ordinary woman who will stop at nothing to find the missing people that the rest of the world has forgotten.

Frankie Elkin is an average middle-aged woman with more regrets than belongings who spends her life doing what no one else will: searching for missing people the world has stopped looking for. When the police have given up, when the public no longer remembers, when the media has never paid attention, Frankie starts looking.