Call of Cthulhu 7th Ed: Nameless Horrors - Rules of Play says:
You won’t find any ghouls or deep ones, or other named Mythos entities here. The horrors found within have no names, but they are still very much of the Mythos. Your players will not have encountered their like before, and no one will be on safe, comfortable ground.
Nameless Horrors brings you six new scenarios that will frighten even the most experienced of Call of Cthulhu players, giving them reason to fear the unknown.