Alright so I read this random book while I was in "confinement" a few years ago...
Been trying to remember the name of it ever since..

It's an older book, like possibly around 1930-50 somewhere in there.
Relatively short ( maybe 200 pages tops), and I want to say written by an English author for some reason (could be way off).

Anyways, its about this underground society of little like 1 foot tall people that dress up in rabbit skins and end up attacking the population...
Starts out with a guy seeing someone get attacked by what he assumes it a rabbit, then ends up with the discovery
of miles of underground tunnels full of this civilization of little killer people, lol.

Might be a pretty bad and vague description but, I dont know where else to ask anymore heh.

Worth a shot.