After a fatal stabbing inside a rental car in London, the crime scene cleaners deal with the aftermath, tackling blood-soaked seats and saturated upholstery. In Phoenix, Arizona, a team make a road safe after a car accident leaves a pedestrian with life-threatening injuries, and in Louisiana, a meth lab hidden in a suburban home is cleared of explosive chemicals.

A man is found dead in disturbing circumstances in Buckinghamshire. A Phoenix pile-up leaves blood smeared across the road. A body is discovered dumped under a car on a Mississippi bridge.