Panacea

He had been here before: numb and lost, a ship without its anchor and no compass to guide him home. He had stood at a fresh-turned grave and tried to understand how something he had thought would last forever had come to an end.

Except that back then, it had been for Sherlock, and of course he had achieved the impossible; he had come back. Mary was beautiful, compassionate, witty and kind, but she wasn't that clever, or that cruel.