The killer shot him from outside and dropped the gun on the back seat. A sunroof does the job too.
A man is found shot dead in the driver’s seat of his car. The gun is on the back seat, the doors are locked, the windows are closed, and there are no bullet holes anywhere in the car. How?
Give me a hintThe hint
Doors and windows aren’t the only way into every car.
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It’s a convertible, and the roof was down
Source: Scott Purdy, The Next Book of OMNI Games, via Jed Hartman’s list of situation puzzles, no. 1.17