Kate and the others have deduced the identity of Master Robe, the culprit behind the phantom mayhem, who then tells them of the cruel secret of Shadows House.
It's highly possible that they
knew about this aqueduct.
.فمن المحتمل جدًا أنهما تعلمان بشأن هذه الترعة
Perciò, è decisamente probabile
 che sapessero dell'acquedotto.
Então é muito provável que
saibam desse aqueduto.