A/N: S3 SPOILER ALERT
So, this is my take on Sherlock's silent break down after he realizes that Magnussen's library is really a mind palace and he knows that he and John are in deep trouble. I imagine Sherlock was trying to come to grips with what he had to do in order to protect his best friend and his wife, and that was something that tore him apart. Because we all know that John is Sherlock's weakness.
But anyway, Sally Donovan was right. Everyone was standing around a body, and Sherlock Holmes was the one that put it there. Maybe she was psychic? Who knows…I actually did miss her in Series 3.
Tangent over, enjoy this rather long poem to the original rhyme "London Bridge".
Falling Down
My mind palace is falling down,
And all my dreams with it too.
My mind palace is falling down,
All my dreams of you.
.
How shall I build it up again,
And all my dreams as well?
How shall I build it up again,
All my dreams that fell?
.
Build it up with one last vow,
And all my dreams won't matter.
Build it up with one last vow,
All my dreams come after.
.
Build it up with words so strong,
And all my dreams stay dormant.
Build it to last for ages long,
Because your dreams are more important.