‘Yes. But he has only been down here as a casual visitor just lately. He has no possible motive. Besides, he is deeply attached to Caroline — just as everyone is.’

‘But he’s unbalanced. What about this attack on you tonight?’

Serrocold waved it aside impatiently.

‘Sheer childishness. He had no intention of harming me.’

‘Not with these two bullet holes in the wall? He shot at you, didn’t he?’

‘He didn’t mean to hit me. It was play-acting, no more.’

‘Rather a dangerous form of play-acting, Mr Serrocold.’

‘You don’t understand. You must talk to our psychiatrist, Dr Maverick. Edgar is an illegitimate child. He has consoled himself for his lack of a father and a humble origin by pretending to himself that he is the son of a celebrated man. It’s a well-known phenomenon, I assure you. He was improving, improving very much. Then, for some reason, he had a set-back. He identified me as his “father” and made a melodramatic attack, waving a revolver and uttering threats. I was not in the least alarmed. When he had actually fired the revolver, he broke down and sobbed and Dr Maverick took him away and gave him a sedative. He’ll probably be quite normal tomorrow morning.’

‘You don’t wish to bring a charge against him?’

‘That would be the worst thing possible — for him, I mean.’

‘Frankly, Mr Serrocold, it seems to me he ought to be under restraint. People who go about firing off revolvers to bolster up their egos —! One has to think of the community, you know.’

‘Talk to Dr Maverick on the subject,’ urged Lewis. ‘He’ll give you the professional point of view. In any case,’ he added, ‘poor Edgar certainly did not shoot Gulbrandsen. He was in here threatening to shoot me.’

‘That’s the point I was coming to, Mr Serrocold. We’ve covered the outside. Anyone, it seems, could have come in from outside, and shot Mr Gulbrandsen, since the terrace door was unlocked. But there is a narrower field inside the house, and in view of what you have been telling me, it seems to me that very close attention must be paid to that. It seems possible that, with the exception of old Miss — er — yes, Marple, who happened to be looking out of her bedroom window, no one was aware that you and Christian Gulbrandsen had already had a private interview. If so, Gulbrandsen may have been shot to prevent him communicating his suspicions to you. Of course it is too early to say as yet what other motives may exist. Mr Gulbrandsen was a wealthy man, I presume?’

‘Yes, he was a very wealthy man. He has sons and daughters and grandchildren — all of them will probably benefit by his death. But I do not think that any of his family are in this country, and they are all solid and highly respectable people. As far as I know, there are no black sheep amongst them.’