Under Your Skin by Rose McClelland

Where is Hannah?
When Kyle’s wife Hannah goes missing, the whole town is out in force to try to find her. One person knows where she is. One person is keeping a secret.
Detective Inspector Simon Peters and Detective Kerry Lawlor have been brought in to investigate the case, but Hannah has left no traces and Kyle has no clues.
Local Belfast resident Julia Matthews joins the #FindHannah campaign and becomes friendly with Kyle, sympathising with his tragedy. As Julia becomes more involved in the case than she bargained for, she begins to uncover more secrets than the Police ever could.
Julia was only trying to help, but has she become drawn into a web of mystery that she can’t escape?