Former police officer Robert and his wife Katy left the city after Robert was injured, while trying to protect a witness in his care. The witness, Susan Reynolds was shot dead. Robert struggles with the guilt he feels over Susan’s death. In an attempt to put the past behind them, Robert and Katy now run a guest house, hidden in the idyllic Lake. A surprise visitor appears, DCI Mark Maxwell, a former colleague and old friend. He suggests that the guest house is perfectly positioned to function as a safe house, Robert is tempted, but will Katy agree?