Due to its length, it didn’t make it to an anthology, but it is certainly one of Leiber’s best works beside the novels.
The title notwithstanding, this is no horror tale of denizens of murky waters, or lurking in the underground.
It is instead a brilliant sociological sci-fi novella, in the wake of Merchants of space or Sheckley.
A device for personal productivity is invented out of an inventor’s whim, but it soon gets out of hand.. a very actual issue! But a gimmick is too simple an object for Leiber: the story is set in a III World War setting, allowing the author to expose his pacifist views satyrizing war-like mentality and the great scares born of it with subtle humour. Also, some fun is poked at fashions in psychology of that time: like in the classification of people into outer-directed and inner-directed ones.