When Jeanne finds 3000 Belgian francs (nearly 75 Euro) is missing from her cash till, Ria insists to use her criminal studies skills to conduct a thorough investigation against everyone in the house, the ideal excuse to snoop around. Only dead-honest Odilon is excused by Jeanne, and brings along some detective equipment he once got from a retiring judicial official. Each student is suspect for some reason, but even the lie-detector made with the oscilloscope Koen just bought doesn't solve the mystery, until it's broken in a hot way by prankster Jo...
—KGF Vissers