Sherlock was bored again and so he took to the streets of London on one Sunday morning, meeting a young woman who seems to have entertained his mind. Sherlock/OC

Sherlock Holmes vanishes at Reichenbach Falls, presumed dead. John spends the next three years trying to move on. J/S

The observations of a brilliant, amnesiac murder witness force John to rethink his assumptions about Sherlock, himself, and the definition of love. Meanwhile, a murderer is still on the loose . . .

Sherlock pushes John too far. John chases Sherlock into the night. A gunshot rings out; and unsurprisingly, that's only the ruddy beginning!