a criminal act so well planned and executed that it cannot be detected or solved
Is stabbing someone with an icicle really the perfect crime?
A devastating attack could come from China, and nobody would know for sure, making it the perfect crime.
And despite the enormity of the act, there is surprisingly little narrative tension as the “perfect crime” looms.
These are really not criminals; they are allegorical figures of perfect crime.
This planet gave him the perfect chance to commit the perfect crime—only he couldn't remember just what it was he had committed.
There is no such thing as an infallible criminal and a perfect crime.