Turmoil in the Empire

Three years after the final problem, the Empire is operating changes in his class system. However, there are resistant who dislike that fact and search to stop these changes. One of their goal: getting rid of the ones started it all: the Moriarty.
On Albert's thirtieth birthday, Mycroft is about to pay him a visit to celebrate it with him when explosions destroy the Tower of London.
Then starts a hunt against the resistant, and amidst that, the raise of a feeling of love.