It was, on its most basic level, an atlas.

Blue-green cover, white lettering. Pages slightly furled as if through repeated use. 'Completely updated edition', the tagline boasted, 'Oxford School Atlas'.

A strange thing to find posted through your letter box, perhaps, but hardly remarkable on the surface.

On the inside of the front cover: a name, and a number. The name: Carl Powers. The number: 〥〦

To Sherlock Holmes, it was, on its most basic level, an invitation.

AN: This story is an experiment. I have a serious problem with procrastination, so I'm seeing if writing in tiny chapters like this will encourage me to work a bit faster. Most of them will be longer than this, though. If you're reading...I hope you enjoy!