A look that chills, a silent request for a key—what forgotten secret waits in the old secretaire?

Noirtier answered only by a look which made Villefort’s blood run cold. He motioned to Valentine to approach. In a moment, thanks to her habit of conversing with her grandfather, she understood that he asked for a key. Then his eye was fixed on the drawer of a small chest between the windows. She opened the drawer, and found a key; and, understanding that was what he wanted, again watched his eyes, which turned toward an old secretaire which had been neglected for many years and was supposed to contain nothing but useless documents.