1944 – The harvest is looming and the Felwood family are hard at work on the farm when 19 year-old Eve arrives. She has been evacuated from London and wants to help out and do her bit for the war effort. A friendship blossoms between Lucy Felwood and Eve but this is put in jeopardy when Dwight, a dashing American airman, comes into their lives. It is Eve who meets him first but then a chance meeting between him and Lucy triggers lies and deceptions between the two girls. Then, one fateful night, the hay barn catches fire. The fire rages and it is too late when they realise that there is someone in the barn.
1975 – Lightfields has stood empty for many years when Vivien and her teenage daughter Clare arrive from London to stay for the summer. Vivien stayed in the area when she was evacuated there during the war but struggles to remember anything about that time. As they settle into their holiday Vivien's distant behaviour starts to concern her daughter. Unbeknown to Clare something has started to stir in Vivien's memory since their arrival at the farm, something unsettling. But that is not all; their arrival has triggered something else, something has woken in the house. The two women are not alone.
2012 – A new generation of Felwoods have recently bought Lightfields. Barry and Lorna live there with their grandson, Luke, and Barry's elderly and infirm father, Pip, has just moved in. Pip lived at Lightfields when he was a boy and this is the first time he has returned. He is disturbed to be back after all these years and won't talk about his childhood on the farm. Pip knows his return has awakened something in the house but he refuses to acknowledge it. What he doesn't know is that there is someone else who is only too willing to see and communicate with this ghostly presence; his great grandson Luke.