A flight from Madrid to New York turns into an international incident after one of the first-class passengers is found dead while the plane is somewhere over the Atlantic Ocean. The man seems to be in perfect health, and there are no obvious signs to point to cause of death. The contents found in the man’s possession, however, suggest that there is more to him than meets the eye. Only a limited number of passengers and flight crew had access to him. Did he simply die of natural causes? Or was his death the result of some sinister plot? Unravel the story of the mysterious first-class passenger and discover what really happened on that flight to Madrid. Difficulty Level: 6.5/10