"Don't sound so cheerful," Ron muttered, stepping over to the wall Harry had indicated, and lighting his wand as well. He ran his hand slowly along it, feeling in the cracks in the stonework even though it made his blood go a little cold to imagine what might be hiding in there. And now he had the lovely image of the three of them being buried alive to contend with, too. He nudged at the stones along the floor with his shoe, tapping on them one at a time.
One of them wobbled a little. He crouched down and pried at it for a moment - it slid out without much trouble, and he swallowed as he leaned closer to peer into the cavity, shining his light down into it. He shuddered as something skittered out. But there was a definite gleam - something was reflecting back at him. "Hey," he said, flatly. He wasn't too eager to touch it all, all of a sudden. "I think - there's something down in here."