[WWTBC] A man who is powerful and considered emotionless visits his wife’s grave believing she is dead.

I read a book awhile back that I am trying to find. It is pretty popular and was about a powerful man whose wife dies. He visits her grave all the time and believes she is dead for four years, until it is revealed that she is actually alive. I think the reason he believed she was dead was because she was being kept prisoner or something along those lines. Anyone have any idea which book this is?