One of the things that occurred to me while I was rereading A Separate Peace was that the two main characters seemed to be an INTp and an ESFp and the relationship between the two resembled one of duality. (How rare and intriguing to see socionic concepts illustrated both accurately and unknowingly!) The themes of this novel could relate to the functions Ni and Fi, both gamma quadra values. So I guess, in a sense, this novel could be considered "gamma."