Cabin in the Mountains

Sherlock faked his death, two years later John unknowingly faked his death. John moved by Mycroft's request to a cabin in the mountains of the States still believing Sherlock to be dead; and Sherlock comes back from the dead, believing Mycroft and his former friends when they say John committed suicide. Four years after Sherlock's fall, two years after John left for the states, what happens when Mycroft (the evil plotter) puts both men in the same cabin in the mountains?