Robin2:
In one of Agatha Christie's stories a guy hid himself in a large decorative chest and bored a peephole in it so he could spy on his wife to see if she was unfaithful. The lover killed him by pushing a stiletto through the peephole.So I think I will give your idea a miss.
...R
Yes, it was a Poirot story, had to use "Zee little grey cells"