"There are our plates," he said as he laid the books down on the table. Then Joe and Tom saw that the books were merely covers pasted over a sort of box into which a whole pie could easily be put. "Catch the idea," went on Teeter. "We are eating in here, which is against the rules, worse luck. But, perchance, some monitor or professor knocks unexpectedly. Do we have to hustle and scramble to conceal our refreshments? Answer--we do not. What do we do?"