Watch Coldwater

After the discovery of the box, John and Fiona go to dangerous lengths to ensnare Tommy.

John and Fiona try to work out a plan, but differ in their opinions. Tommy finds himself in a troubling situation after a tour group stumble upon something sinister.

John is full of regret over his friendship with Tommy and attempts to voice his suspicions to Fiona, who feels she needs space from her husband. However, she soon learns more than she bargained for when Catriona arrives to deliver a stark warning about Tommy. As Fiona's frustrations with John reach boiling point, they culminate in a confrontation with Tommy that spirals dangerously out of control and leads to a startling confession.

Tensions rise as John and Fiona attend the funeral of a beloved local resident, before hosting old friends from London. Tommy and Rebecca are thrown into a panic when they discover their son Cameron has gone missing. John and Fiona attempt to maintain the appearance of a contented life in front of their friends, but old wounds resurface and it's not long before Tommy shows up to their dinner unannounced.

John struggles to cope with his guilt but a bizarre hunting trip changes his perspective. Tommy's influence on him grows.

After failing to intervene in a violent incident at a London playpark, John moves his family to the rural Scottish Idyll of Coldwater, where their new neighbours harbour a dangerous secret.