What is the theme in Bag of Bones by Stephen King?

Love and connection are both themes in the story. When Mike loses his wife unexpectedly and without warning of any kind, his life is derailed. Even the one escape that he has always been able to count on, his writing, fails him. He is so filled with remorse and with regret that it manifests itself at the computer to such a degree he actually becomes physically ill at the thought of writing again. He covers this inability, telling himself it is simple writer's block, and using manuscripts he has written in previous years as current submissions, and for four years he coasts. He never once thinks about how closed off he could become when he was writing, and how much of Johanna he shut out in his Narnia like creations.