1947 weird tale: "Venturer of the Martian Mimics" by British author Eric Frank Russell

Thanks to Tinkoo Valia of the blog Variety SF, I just learned about "Venturer of the Martian Mimics", a novelette written by British science fiction author Eric Frank Russell that was published in the May 1947 issue of Weird Tales (Canadian edition). A tale about the exploits of a Martian spy on Earth, here is Tinkoo’s summary of the storyline:

This is a detective story: Chief Inspector McKechnie of Scotland Yard, with help from Dr Lanigan, solving the case of very unusual phenomena happening around London & then in rest of Europe: a man murdered by electrocution several miles from nearest power lines, then he's seen boarding a bus & a train several hours after his death! A shape shifter that gives electric shocks to anyone touching it. Someone breaking into sensitive installations clearly for espionage purposes. They'll eventually kill the uncatchable.

Tinkoo gives "Venturer of the Martian Mimics" an "A." I haven’t read the story, but if you are persistent enough, you can download and read it for free as part of a larger package of old pulp magazines.