Holmes was once again sitting in an armchair in his apartment on Baker Street, lost in thought as he stared at the wall in silence. His violin was on his lap, he played a few random notes every now and then, not playing a specific song.

He hadn't received any clients lately and everything was quiet, so usually the famous detective found himself bored with nothing to do...

Watson had gone on a trip with his wife, so he didn't have his friend to keep him entertained either.

Suddenly the sound of a light knock catches his attention, taking him out of his thoughts and making him look towards the door. He's silent for a while, before responding with a soft 'come in.