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A boarding school without any storms, no adults, no rules: the best vacation EVER for the Einsteiners Io and Joyce. Until they are woken up in the middle of the night by strange noises after a film marathon. Were there burglars in the boarding school? A few hours later, while visiting their aunt Yagmur, the Pfefferkörner came across a new case in the nearby Erfurt monastery museum. Coincidence?