Sherlock and Joan

Sherlock saw at least 3 different exits from where he stood but all were to far to hatch an escape attempt that wouldn't involve a casuality. He knew what is was like to be shot but didn't want to experience it again. He checked his watch it was ten to eight, he needed to send a signal to Gregson but how? He looked round him for something that could help, he noticed a button the right hand side of the mural which could be the buildings old whistle to alert the men work was finished. But getting to it would prove to be a challenge.

'Which one of you is lying?'
'Micheal we've been doing buisness...

'What are you doing here?'
'Can't a guy drop por and say hello?'
Sherlock stepped outside, shutting the door behind him.
'When the guy happens to be a current drug addict, no he can't.'
'You're one to talk.'
'I've been clean for almost 3 years.'
'Well congrats to you(!)' Oscar looked up at the brownstone. 'Nice place, daddy buy it for you?'
'He did.'
'You on your own?' Sherlock held up his left hand. 'Your married?'
'Almost two years.'
'Does she know about your past? Irene? The drugs?'
'She knows it all. Now, what do you want?'
'I was hoping for a fix.'
'Not likely, now if you excuse me.' Sherlock went...