Harder by Robin York is the second book in her Caroline & West series. I am amazed by how much I love this lady's writing. Just amazed. I had to do a quick chapter skim on Deeper to remind myself of what happened to bring us to where Harder began. I got so caught up that I almost re-read the entire first book again, it was that good. 
 This book picks up a few months after the cliffhanger ending of West leaving Caroline to fly back home and take care of his sister. We knew it was coming but that didn't make it any easier. The late night phone call that Caro gets from West, telling her his father's dead launches them back into each other's orbit. 
 A powerful story of two people so much in love that despite how badly broken they've been at different times of their lives, they persevere and continue because they've found that someone that makes their lives worth it. Even apart, they both survive better knowing (or thinking) that what they're doing is best for the other one. 
 I resented every moment I had to put this book down and resume the responsibilities of my own life (taking care of child, feeding myself and said child, bathing, going to work, etc). You must read book one first and I highly recommend that you do. Robin York/Ruthie Knox, you are amazing!