Iona returns to the island where she was born with her teenage son to seek refuge from a violent crime in Glasgow. Iona's return exposes her tormented son, Bull, to a way of life she rejected when she left the island and sends a shockwave through the family she left behind.
| Actor | Role |
|---|---|
 Ruth NeggaIona | Iona |
 Douglas HenshallDaniel | Daniel |
 Michelle DuncanElizabeth | Elizabeth |
 Tom BrookeMatthew | Matthew |
| BBen GallagherBill ("Bull") | Bill ("Bull") |
 Sorcha GroundsellSarah | Sarah |
| CChristine SteeleYoung reader | Young reader |
 Mathew ZajacDetective | Detective |
 Jim SturgeonStephen | Stephen |