'Was there a third point?' asked Butler innocently.
'Yes,' said Artemis, a touch testily. Still no sign of the individual he was expecting. 'I was about to say that if there is a gunman on one of these buildings, it's that one directly to the rear. So you should stay behind me.'
Butler was the best bodyguard in the business, and even he couldn't be a hundred per cent sure which rooftop a potential gunman would be on.
'Go on. Tell me how you know. I know you're dying to.'
'Very well, since you ask. No sniper would position himself on the rooftop of Casa Mila, directly across the street, because it is open to the public and so his access and escape would probably be recorded.'
