Man from U.N.C.L.E. Section VII

So, just a summary would be enough? For this one, eg: 'Checking out a dead Thrush's office, Napoleon and Illya hear a sinister scrabbling behind a wall. They find it slides open, to a mysterious underground and nonhuman civilisation, who turn out to be not quite as Lovecraftian as they first appear. The agents hope. Waverly agrees they should be left alone, but just in case a monitor is set up.'