commercial airliner makes a normal landing at an airport and taxis to its normal stop. The only problem is that when the doors are opened, there are no passengers and no pilots. An experienced FAA investigator, Grant Sheckly. is assigned to the case. Sheckly has a good reputation and good track record at solving crashes but this case is a difficult one explain. It all begins to get clearer when he realizes that not everyone is seeing exactly the same thing. For some the seats are blue, others see brown and others see red. They all see different registration numbers on the aircraft. Sheckly can only come to one conclusion: what they are seeing is an illusion.

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