Caddy Compson is a tragic character, and the heart of her tragedy is 
revealed in two intense, excruciating conversations with Quentin. The second, the 
night before her wedding to Herbert, is suffused with deep despair 
and unbearable anguish. The only way Caddy, a girl who can never forget 
her family’s pride and the social code by which she has been raised, can
 escape her impossible situation is by marriage to a man of respectable 
family, even if that man is unworthy of her. Caddy is sick with her 
pregnancy, sick with worry about Benjy and Father, sick at the prospect 
of marrying a man she can never respect for the sake of preserving 
appearances and placating social convention. But in that conversation 
she alludes to an even more important side of her character when she 
says to Quentin, “since I since last summer” and “I died last year.” 
Although she cannot bring herself to finish the first sentence, her 
words suggest that the key to understanding the hell on earth in which 
she has lived for the last year and from which she must escape at all 
costs lies in the events of the preceding summer.
Caddy’s
 first conversation with Quentin, crucial to our full understanding of 
what happened to Caddy that summer, took place one evening at the branch
 where she and Quentin have played since childhood. Like their brother 
Benjy, Quentin has somehow intuited Caddy’s loss of virginity, and to 
Quentin’s obsessive regard for family pride and the social codes of the 
old South, the knowledge is horrifying, undermining the very foundations
 of his identity. But Quentin’s understanding is limited by his 
inability to accept the passing of time or his sister’s growing 
womanhood and the changes both have wrought in the idyllic and idealized
 version of Caddy he carries within himself. Therefore his whole being 
yearns to deny what has occurred, his every thought becomes a desperate 
attempt to make the horror vanish, by falsely claiming incest so he and 
Caddy can be sent away together, by running away and taking Benjy with 
them,  even by a mutual suicide pact.
What Quentin 
cannot understand or acknowledge, however, is that what has happened to 
Caddy is not only a social disgrace, anathema to his code of honor, but 
also something rare and magical and wonderful. For Caddy—passionate, 
headstrong, courageous, willful, maternal, devoted and defiant, to whom 
young men have been attracted since she was fourteen—has found with 
Dalton Ames the most mysterious and precious and powerful force in human
 life. She has discovered the dizzying passion and desire of love. And 
because she has fallen in love with Dalton Ames, because the mere sound 
of his name makes her blood race, she has given herself to him, body and
 soul, and the resulting explosion destroys her entire family. Because 
Caddy falls in love, Mother rejects her, despises her, and spies on her;
 Mother and Father argue bitterly about her; Father drinks more and more
 heavily; Caddy and Dalton are somehow torn apart; Caddy’s emptiness and
 despair lead her to promiscuity, pregnancy,  marriage to a despicable 
man, and exile from her family; Quentin’s life becomes unbearable and 
ends in suicide; Benjy is left to endure a lifetime of inexhaustible 
grief and loss; and her daughter Quentin is raised in a house where she 
will know neither mother nor father—all because a vibrant, radiant, 
passionate girl of seventeen fell in love.
The Sound and the Fury
 is a modern Southern tragedy, and like all tragedies, the suffering and
 destruction it portrays spring from the most fundamentally human 
qualities of its characters. Of these characters, by far the most human,
 the most fully alive, and, in the end, the most utterly betrayed by 
life, is Caddy Compson (625).