This is one for the internet geeks out there. 'Anonymous' has been in touch:
'I've emailed you a little message. A little game to play. I do like games.' And he has, indeed, emailed me.
A Roman Emperor will help you work out what this means.
DSPCWZNV T LX HLENSTYR JZF
Obviously, it's a secret code. See how you get on. I'll post the solution later in the week.
SHERLOCK I AM WATCHING YOU
This is a Caesar shift cipher! Simply replace each letter in the message with the letter that is 15 places further down the alphabet. Find out more about the Caesar cipher on Wikipedia