‘But he mentioned no name to you?’

‘He mentioned no name. We agreed that we must investigate the matter thoroughly, and he suggested inviting the advice and co-operation of Dr Galbraith, the Bishop of Cromer. Dr Galbraith is a very old friend of the Gulbrandsens and is one of the trustees of the Institute. He is a man of great wisdom and experience and would be of infinite help and comfort to my wife if — if it was necessary to tell her of our suspicions. We meant to rely on his advice as to whether or not to consult the police.’

‘Quite extraordinary,’ said Curry.

‘Gulbrandsen left us after dinner to write to Dr Galbraith. He was actually in the act of typing a letter to him when he was shot.’

‘How do you know?’

Lewis said calmly:

‘Because I took the letter out of the typewriter. I have it here.’

From his breast pocket, he drew out a folded typewritten sheet of paper and handed it to Curry.

The latter said sharply:

‘You shouldn’t have taken this, or touched anything in the room.’

‘I touched nothing else. I know that I committed an unpardonable offence in your eyes in moving this, but I had a very strong reason. I felt certain that my wife would insist on coming into the room and I was afraid that she might read something of what is written here. I admit myself in the wrong, but I am afraid I would do the same again. I would do anything — anything — to save my wife unhappiness.’

Inspector Curry said no more for the moment. He read the typewritten sheet.

Dear Dr Galbraith.

If it is at all possible, I beg that you will come to Stonygates as soon as you receive this. A crisis of extraordinary gravity has arisen and I am at a loss how to deal with it. I know how deep your affection is for our dear Carrie Louise, and how grave your concern will be for anything that affects her. How much has she got to know? How much can we keep from her? Those are the questions that I find difficult to answer.

Not to beat about the bush, I have reason to believe that that sweet and innocent lady is being slowly poisoned. I first suspected this when —

Here the letter broke off abruptly.

Curry said:

‘And when he had reached this point Christian Gulbrandsen was shot?’

‘Yes.’

‘But why on earth was this letter in the typewriter?’

‘I can only conceive of two reasons — one, that the murderer had no idea to whom Gulbrandsen was writing and what was the subject of the letter. Secondly — he may not have had time. He may have heard someone coming and only had just time to escape unobserved.’

‘And Gulbrandsen gave you no hint as to whom he suspected — if he did suspect anyone?’

There was, perhaps, a very slight pause before Lewis answered.