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dutchguy1986
Since: Jul, 2014
25th Mar, 2024 12:03:27 AM
The short story Hard Shell by Dean Koontz in Strange Highways
fits that description pretty well
Chabal2
Since: Jan, 2010
25th Mar, 2024 01:01:48 AM
That's exactly it, thanks!
A short story that starts out as a detective story, then it's revealed the killer is actually an alien that can flatten and extend its body so locked doors aren't a problem, then while it's gloating the detective reveals himself to be an alien as well (can't remember if they were the same type) and defeats the killer.
Edited by Chabal2