Over The Edge, by Cara Loconte

Olivia and her psychiatrist husband Paul have moved to the Blue Mountains for a fresh start. Everything is going well until their autistic daughter draws a freakily accurate picture of her paternal father Daniel, whom she’s never met. When Olivia finds out that he has just died down the road, her heart nearly stops; Was he coming to see her? Is he there now?
Olivia soon realises that Daniel won't be at peace until the truth is told, but her husband insists they do not tell anyone. As she begins to unravel a web of lies her husband gets more desperate for things to be normal. But how can you explain to a psychiatrist that you are working through issues with a ghost, without him thinking you’ve lost your mind?