It's 1944, and while sheltering during an air raid, Roger strikes up a conversation with Verity, a Wren (Nancy Carroll).
When he asks if she dreams, he begins to recount the haunting vision that has followed him for most of his life: a recurring dream of a mysterious house, a silent family on the lawn and an unseen, unidentified terror lurking in the room in the tower.
Polly Walker also features in the BBC's 11th annual traditional Christmas Eve ghost story, showing at 10pm on BBC Two and iPlayer thereafter.
When he asks if she dreams, he begins to recount the haunting vision that has followed him for most of his life: a recurring dream of a mysterious house, a silent family on the lawn and an unseen, unidentified terror lurking in the room in the tower.
Polly Walker also features in the BBC's 11th annual traditional Christmas Eve ghost story, showing at 10pm on BBC Two and iPlayer thereafter.