La boussole du Club des Cinq

Impossible! Claude's father invited a learned friend to work with him in Kernach during the holidays... and there the Famous Five were kicked out of the Villa of the Seagulls! Be that as it may: François, Claude, Mick and Annie will go and settle in the old abandoned lighthouse at Cap des Tempêtes. There, at least, they won't bother anyone! No one, really? So why were the young vacationers' bags searched? And who stole the key to the old lighthouse? Enough to lose your bearings...