Shiverstone Castle 2 (2017)

Both boarding schools flirt with cheating at the annual lake games, but the count crashes with his zeppelin, ending up in a hospice with crushing debts. A weird distant cousin Cuno, his only kin heir, arrives by motorbike and soon agrees to sell the castle to Chinese theme park group Wang, telling Rex and Jean to prepare a school merger, presumably the girls' Rosenfeld. Having learned about a medieval treasure left during heretic persecution and a papal siege, Ottokar's bunch of five leads the search, which alas leads to Rosenfeld, so they must deal with nosy girls as well as school staff and delay the Chinese delegation.