Sherlock, Series 1

[Sherlock and John encounter Raz, a graffiti artist, spray-painting a doorway]

Raz:
Part of my new exhibition.

Sherlock:
Interesting.

Raz:
I call it Urban, uh, Bloodlust Frenzy. [sprays away]

John:
Mm. Catchy.

Raz:
I've got two minutes before a community support officer comes round that corner. Can we maybe talk whilst I'm working? [Sherlock hands Raz his phone and he scrolls through photos of the ciphers from the bank. Raz hands John his spray paint can]

Sherlock:
Know the author?

Raz:
I know the paint. Looks like Michigan, hardcore propellant. I'd say zinc.

Sherlock:
And what about the symbols? Do you recognize them?

Raz:
It's not a tag. I'm not even sure it's a proper language.

Sherlock:
Two men have been murdered, Raz. Deciphering this - it's the key to finding who killed them.

Raz:
This is all you got? Not much to go on.

Sherlock:
You think you could help out?

Raz:
I'll ask around.

Sherlock:
Someone must recognize it. [Two community police officers notice them and come running around the bend]

Community Support Officer:
Oi! [Sherlock and Raz take off, leaving John with Raz's bag of spray paint cans] What the hell do you think you're doing? This gallery is a listed public building!

John:
Oh no, that wasn't me who painted it. I was just... Just holding this for... [The officers look at Raz's display, and then at the bag of spray paint]

Community Support Officer:
Bit of an enthusiast, are we?