So choose two Main Characters to Die in Season 4: Sherlock & John are excluded from execution for obvious reasons.
1.) Least Devastating
2.) Would absolutely break your heart
For both Why?
The British Library has reminded me that on this day in 1930 Sir Arthur Conan Doyle died.
and they have provided us with a link to one of his manuscripts for Sherlock Holmes, I thought I would share.
http://www.bl.uk/learning/timeline/item126860.html