For a second I thought this was an invocation of one of those informal "laws" (like a Murphys Law or Sturgeons Law), describing the feeling of finding one great thing and lamenting that there's no more like it.

So the hope of it being your discovery of a rich genre turns into the lament that it's one of one (how I feel about the Three Body Problem). But no, it's a real book. And looks like a great suggestion from what I can tell on wiki.