The presenter receives four famous persons who quiz against each other, but one of them is cheating. That's the 'know it all', he or she gets all the correct answers whispered through an earpiece and is therefore heading for an easy victory. It's up to the 2 unknown players to unmask the cheater and win €5.000.
For the curious viewers there's a change to discover the 'know it all' before the game starts. They just have to call a special telephone number to discover who is cheating.