Lock and Key by Dessen, Sarah (2009) Paperback

Publication Date: 2009 A New York Times bestseller Unlock your heart and the rest will follow. Ruby is used to taking care of herself. But now that she's living with her sister, she's got her own room, she's going to a good school, and her future looks bright. Plus there's the adorable boy next door. Can Ruby learn to open her heart and let him in?