An American cargo plane attempts a difficult landing at the US naval station at Guantanamo Bay, Cuba. With the runway just a few meters from the armed border, the maneuver requires avoiding Cuban airspace. But something goes terribly wrong on its final approach, and the DC-8 crashes at the end of the runway. At first, investigators wonder if Cuba somehow played a role in the crash, but they eventually uncover an invisible culprit that threatens the lives of cargo pilots everywhere.