@Augustus
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You wouldn't be able to figure that much out from the sound.
Upon investigation, the books on the shelf seem to be mostly about stonecraft and mining. One of the books is written in a language that Cedric doesn't recognize.
The rug is pulled back to reveal... the stone floor. There seems to be nothing of interest under it.
As Devlin enters the house and begins to search, he feels a thud on the back of his head - the massive arm of Chaoros accidentally hitting him, as he turns to Devlin upon hearing the words "lamb shanks".
Devlin, very dizzy now, tries to look around the house, albeit with bad sight. By the bookcase, however, Devlin feels something. A slight break in the stone floor, almost imperceptible unless you were on the ground, reeling from the blow of a goat man. With the help of a flat metal tool, conveniently placed against the bookshelf, someone could easily (no check needed) pry up the piece of floor, which is a square large enough to comfortably fit a medium creature.