Ex-cop Robert and his spouse Katy decided to abandon urban life following an incident where Robert was injured while safeguarding a witness under his protection. Tragically, the witness, Susan Reynolds, was killed. Robert has been grappling with the remorse of Susan’s death. To move forward, the couple now manages a secluded guest house in the picturesque Lake District. Unexpectedly, DCI Mark Maxwell, a former colleague and longtime friend, pays them a visit. He proposes that their guest house is ideally situated to function as a safe house. Robert finds the idea intriguing, but will Katy be on board?