The Adoration of Jenna Fox by Mary E. Pearson
"How far would you go to save someone you love?"
As a teen novel, this book works on many levels. There's the usual teen angst (trying to fit in, self-discovery, dealing with parents, falling in love). But there's also deeper levels here - what it means to be a human, what is a soul, what is the mind.
Jenna Fox is a 17 year old girl who wakes from a year+ long coma and finds herself in a world that is foreign to her. As her memory slowly returns, and as she begins to uncover some secrets her parents are keeping, she finds that she has found more questions than answers.
Can Jenna accept that sometimes there aren't answers at all?