Dear Lizzie by Annie Lyons
Annie's a fellow Carina author who I met at the RNA party in the summer. This is her second book published by Carina.
Lizzie's beloved sister Bea has just died of cancer, and Lizzie is bereft. She's estranged from the rest of her family, due to complex events which happened when she was a teenager. Bea was her only link and her only friend. Bea leaves her 12 letters, to read one a month for the year following her death. Each one contains a challenge designed to help Lizzie move on, become stronger, and build a better life for herself.
This is a really warm, tear-jerker of a novel. I can't count the number of times I needed to reach for a tissue. It's a wonderful exploration of human relationships in all sorts of ways, and I would highly recommend it.