By 1913, Number 5 is home to respectable couple Frederick and Louisa Pryce Lewis. From a clue in the family photo album, David follows the trail of their younger son Walter, tracking him from Australia to the battlefields of Gallipoli and finally back to Leeds, where David discovers that Walter has turned to a life of crime.

Successful textiles chemist Percival King and wife Rose are the next to move into the house with their young daughter. But this apparently happy family is split apart when Percival suddenly resigns from his job, admits himself to a psychiatric institution then disappears without warning.

Our next residents, Laurence and May Bendit, are a married couple with a shared passion for the spiritual movement of theosophy who raise their young children at Number 5. But when Laurence develops an interest in the paranormal, an encounter with a mysterious clairvoyant puts his marriage under threat.