Here in Germany, there was once a line of youth books called the "Burg Schreckenstein" series in the 70s & 80s.
I think it was popular, but Iä#ve never met fans of it (although I do know they are out there, because there i a web site on the series out there.
It's about a part of a vboys-only boarding school which must go into a castle because the school rooms have become too small.
And the boys decide to transform themselves by adaping rules they believe the "Knights" of the castle would have had : Honesty, truth and honour (well, partly).
Needless to say that on the other side of the lake the castle stands next to there is a girls-only bording school, and both parties often meddle with one another by playing tricks on one another.
Unfortunately there doesn't exist any English-language Wikipedia entry (which surprises me a little bit, given that the series was somewhat popular at its time) - here is the German-language entry : http://de.wikipedia.org/wiki/Burg_Schreckenstein
I assume that translation progams might be able to translate it (like the google translation program, for example).