Oh, the John Boyne plaint reminds me of a book I read about a thousand years ago. Great writing, spooky set up...the heroine and her husband move into what is, presumably, a haunted house. Dreadful things occur, she feels a hand touch her shoulder, the friendly elderly neighbor brings his dog over to keep them company (SOMEONE read "The Woman in Black")...and the dog disappears after playing with a strange dog no one had seen before... and they don't know whether to tell the neighbor or not, so they don't and even though he has been a HUGE part of the novel up to this point, he is never seen or heard from again....and it all leads up to......nothing. At some point, the heroine's husband falls down stairs and dies, or she kills him accidentally, or the spirit in the house tries to possess him to get to her....and at the end, she sees him standing in the doorway of the house and can't decide if she should return to the house with "it" or run in the opposite direction. The end.
The best part of the book after that was the "trick" photo of the author in which she is shown to have three arms.
If you are going to write a super scary haunted house story a la The Woman In Black, your ending has to be a lot more than the heroine dithering around.