Joachim Friedrich, Regina Kehn

4 ½ Friends and the Mystery of the Missing Teachers

When the students set off on a class trip to a castle on the Rhine, all the teachers going with them are in the best of health. But it is not long before the first of them is struck by a mysterious illness. The thought of a life without teachers may indeed be tempting, but Kalle decides that a true detective investigates even a case like this one.

Sold to:
China, Czech Republic, Greece, Korea, Latvia, Lithuania, Poland, Slovenia, Spain (Spanish), Turkey, Israel (Hebrew), Serbia, Spain (Catalan), Spain (Basque), Portugal