The obvious theme in this piece is redemption; that is, the act of being brought back. We can see similar themes nearly everywhere we look. In A Tale of Two Cities, Sydney Carton redeems Charles Darnay by dying in his place, while at the same time being redeemed in the reader's eye by giving up his life. In Pride and Prejudice, Lydia is "redeemed" by Darcy by being getting to marry Wickham, thus, raising herself from apparent doom.
There are two perspectives stories like to follow: the perspective of the redeemer and the perspective of the redeemed. We like to read the perspective of the redeemer because they seem noble. We like to read the perspective of the redeemed because they remind us of ourselves.
It's interesting to note that in nearly all redemption stories there is a Christ-figure. If someone is going to be redeemed, there has to be redeemer. Salvation is perfectly free, but only to us; it cost God incomprehensibly. I believe this influence is a good thing. It urges us to think about the Gospel and God. My mom always said "Every good story has a Christ figure." I think she was right.