Beneath the Shadows by Sara Foster

With her young daughter, Millie, Grace has returned to a small town in Yorkshire where her husband, Adam disappeared a year ago. Grace and Adam had moved to the cottage that Adam's grandparents left to him when they died. Not long after arriving from London, Adam went missing while out with Millie.  Millie, unharmed in her stroller, was left at their front door.  Grace has returned to clean the house of Adam's family's possessions, then rent it out. While there, Grace is constantly haunted by thoughts of Adam and what might have happened to him. Between a creepy house, a neighbor that she doesn't entirely trust, and discovering that Adam might have been keeping things from her, Grace can't wait to leave for good.  But is she in danger herself?  Beneath the Shadows is a page turner in the tradition of Serena Mackesy's Hold My Hand and Sophie Hannah.