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Champion detective Flecher is concerned about the health of his assistant Theo. Theo is nauseated and shaking because of an impending test. Thanks to some miraculous exercises, the boy pulls himself together and does surprisingly well on all his maths tests! But the work of the whole class disappears...

Who did this and why was it necessary? Why are all the students now forced to attend extra classes? And most importantly: will Theo be able to continue to help the champion detective?