'But what leads you to the conclusion that this Blake is merely a clone?'

'You know my methods, Vila, apply them!'

'Has anything escaped me?' I replied with self-importance. 'I trust that I have not overlooked any features of material consequence. You yourself reported that I have been an invaluable help to you in many of your former deductions.'

'I'm afraid my dear Vila, that most of your conclusions have been erroneous. When I said that you stimulated me, I meant to be frank that in noting your fallacies I was occasionally guided towards the truth.'

'I say, steady on, Avon.'

Alison