Prison transport officer Amber Todd and hitman prisoner Tibor Stone are handcuffed together after their convoy is ambushed, forcing them to evade killers while navigating moral choices to shield Amber's family and get Tibor to testify. The six-episode story centers on survival, uneasy alliance, betrayal, and high-stakes chases across London, with episode synopses and overall premise containing no references to identity politics, systemic issues, or social justice framing. Casting places diverse actors in the central roles of Amber Todd and Tibor Stone, yet this diversity remains incidental and unremarked upon in the narrative itself.

Creator Matt Charman has stated that the concept grew from a simple observation of a transport van, with his focus directed at relationship dynamics and action rather than activist intent. The result is a series whose entertainment value rests on straightforward thriller mechanics without ideological intrusions.