Nathan's increasing obsession with the spirits haunting Shepzoy is taking its toll on Charlotte and the farm. And his attempts to involve Harriet in his experiments infuriate the Dennings. Will he risk all his relationships to pursue the truth? No one believes what he's seen and heard, and even Nathan is left wondering if it's all just been in his head. It's All Hallows Eve, and when one of the railway engineers is left so terrified by a haunting vision that the railway suspends all work, Nathan is convinced he must find a way to banish the spirits from Shepzoy.