The Haunting of Hollymount Farm

S2, E1: Liam grew up on an idyllic, remote farm. But his happy childhood was marred by ghostly sightings of a little boy and an overbearing, oppressive presence, making him so terrified that, even as an adult, he refuses to go upstairs in his house alone. Danny Robins investigates the case and uncovers decades of hushed-up, terrifying testimonies. Who could this little boy have been?