The 2017 Las Vegas shooting, carried out from a room on the 32nd floor of the Mandalay Bay resort during the Route 91 Harvest festival, is the subject of this documentary, built around footage and access the filmmakers describe as previously unreleased. The film reconstructs the night hour by hour, from the first shots fired into the crowd below to the scramble by police and festivalgoers to understand what was happening and where the danger was coming from. It examines how the shooter, Stephen Paddock, was able to accumulate weapons and ammunition undetected in his hotel room, and traces the response by Las Vegas Metropolitan Police as they located and breached the room. The film sits within the true-crime tradition of mass-shooting documentaries, using survivor and investigator accounts alongside footage from the scene to lay out the timeline of the deadliest mass shooting in modern American history, without straying into advocacy for any particular policy response.