"That's asking for assistance. I'll give you this much. It's in the wall, concealed by a panel of wood. Now I've given you the scent, follow it to a finish--if you can."

"In a room like this there might be fifty hiding-places."

"There might."

"It would take days to examine it thoroughly; however long it might take me I'd find it. I'd strip the walls of everything before I'd give it up."

"I don't think you need go so far as that just yet. Look round; you've hawk's eyes; I've given you a hint; can't you make a likely guess, like the sharp-witted child who is playing hide-and-seek?"

Isabel's glances were travelling round the room searchingly, resting here and there, allowing nothing to escape them. When they had traversed the whole apartment from floor to ceiling in one direction they returned in another.

"You are not tricking me? There really is a secret hiding-place?"

"There really is."

"And you say it's behind a panel in the wall?"

"That's it."