I hate to say that I have read the first several books in that series... the "Theta" is Theta Alpha Theta, and it is Pi Beta Phi used. I was floored when I saw that because it doesn't seem like the type of thing that Pi Beta Phi would permit their name to be used for.
The books portray all of the sororities pretty negatively, especially Theta Alpha Theta. They will only offer a bid to the twin that wants it IF she makes the twin that doenst want be a Theta take one. They do all sorts of horrible hazing crap, and are generally shallow and vicious.
The Pi Beta Phi's get the best portrayal in the book. They are the un-sorority, they don't wear sorority blazers, and they are down-to-earth, very environemtnal, and full of activists.
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Laura
Beta Sigma Phi, FL Nu Alpha Chapter
Kappa Zeta Pi Independent Sorority
Forget regret, or life is yours to miss. - Rent
http://www.geocities.com/localsororities
[This message has been edited by localsororities (edited July 05, 2001).]