‘Quite so,’ said the Inspector.

‘Well, we found that none of the bus-passengers last Monday could be the letter-writer,’ said Fatty, ‘and certainly none of them posted a letter. So then we decided to find out if any regular Monday passenger was not on the bus that Monday, and make inquiries about them. And as you know, we found that three regular passengers didn’t travel that day - Miss Tittle, Old Nosey, and Mrs. Moon.’

‘Mr. Goon also worked on the same lines,’ said the Inspector. A sound from Goon made everyone look up.

‘How did you get to see them letters, and see the post-mark?’ demanded Mr. Goon. ‘That’s what I want to know.’

‘Oh, that’s not an important detail,’ said Fatty, anxious not to give away Gladys’s part in that affair. ‘Well, to continue, sir - we found out next that another letter had been sent that Monday - but not from Sheepsale - it had been delivered by hand. So that definitely pointed to somebody in Peterswood, and possibly one of our three Suspects - Old Nosey, Miss Tittle, or Mrs. Moon.’

‘Quite,’ said the Inspector, deeply interested. ‘I must say that your powers of deduction are good, Frederick.’

‘Well, the letter was delivered very early in the morning,’ said Fatty, ‘so I had to find out which of the three Suspects was up early that Tuesday. And I found that all of them were!’

‘Very puzzling,’ said the Inspector. ‘I don’t think Mr. Goon got quite as far as that, did you, Mr. Goon? Go on, Frederick.’

‘That rather shook me,’ said Fatty, ‘and the only thing I could think of next was getting specimens of the handwriting of each of the three - to compare with the printed letters, you see.’

‘A good idea,’ said Inspector Jenks, ‘but surely a little difficult?’

‘Not very,’ said Fatty modestly. ‘You see, I put on a disguise - a red-headed delivery-boy I was.’ There was a snort from Mr. Goon at this.

‘And,’ went on Fatty, ‘I just delivered parcels to all three, and got them to sign receipts in capital letters - so that I could compare them with the capital letters in the anonymous notes!’

‘Most ingenious, if I may say so,’ said the Inspector. He turned to Mr. Goon, whose eyes were bulging at hearing about all this detective work on Fatty’s part. ‘I am sure you agree with me?’ said the Inspector. Mr. Goon did not agree with him at all, but couldn’t very well say so.

‘Well, I found that Nosey couldn’t write at all,’ said Fatty. ‘So that ruled him out. Then I saw that Miss Tittle’s printing, very small and neat and beautiful, wasn’t anything at all like the printing of the letters in the anonymous notes - and that rather ruled her out too - and to my surprise Mrs. Moon’s printing was such a mixture of big and small letters that I couldn’t think she could be the culprit either.’

‘And I’m not!’ said Mrs. Moon, rocking herself to and fro. ‘No, I’m not.’

‘Here’s a specimen of her writing - or rather, printing, sir,’ said Fatty, opening his notebook and showing the Inspector Mrs. Moon’s curious printing, big and small letters mixed. ‘When I asked her about it, she gave me to understand that she couldn’t help it - it appeared to me, sir, that she was muddled in her mind as to which were big and which were small letters.’

‘Quite,’ said Inspector Jenks. ‘So you ruled her out too, as the messages and the addresses on the anonymous letters were apparently printed quite correctly in capitals, with no small letters at all?’

‘Yes, sir,’ said Fatty. ‘And I almost gave up the case. Couldn’t see any light anywhere - and hadn’t got any real clues, either. I didn’t think at the time, either, that Mrs. Moon would write an anonymous letter to herself - though I should have thought of that, of course...’

‘And what about that letter to me? ’ said Mr. Goon, suddenly. ‘That was you, wasn’t it, Master Frederick? Come on, you own up now - that was you, calling me a meddler and a muddler and cheeking me like you always do!’

‘No - I certainly didn’t write you that letter,’ said Fatty. ‘And I think if you compare it with the others, Mr. Goon, you’ll see it’s just like them.’

‘Well, Frederick - how did you come to know in the end that it was Mrs. Moon and nobody else?’ inquired the Inspector.

‘I tell you it wasn’t, it wasn’t,’ moaned Mrs. Moon.

‘That was a sheer bit of luck, sir,’ said Fatty, modestly. ‘Can’t give myself any marks for that! It was Mr. Goon who put me right on the track!’

‘Gah!’ said Mr. Goon disbelievingly.

‘Yes - he suddenly gave us a whole sack of clues - that sack of things on the table!’ said Fatty. ‘And, as soon as I saw them I was able to piece things together and know who had written those disgusting, spiteful letters!’

The Inspector picked up the things one by one and looked at them with interest. ‘Exactly what did these things tell you?’ he said curiously.

‘There’s a dictionary, sir - with Pip’s name in,’ said Fatty. ‘That told me that it probably came from this house and was used by somebody living here. Then I noticed that various words had been looked up for the spelling, and had been underlined - and every one of those words, sir, has been used in the anonymous letters!’

Mr. Goon’s face went redder than ever. To think that boy had got all that out of the things in that sack!

‘The next thing, sir, was the alphabet book,’ said Fatty. ‘And, as I daresay you’ve noticed, the alphabet letters in such a book are always in capitals. A is for Apple, and so on. So I guessed that book had been bought as a kind of reference book for capital letters, by somebody who wasn’t quite sure of the difference in shape of big and small letters. The capital letter G, for instance, is quite different from the small letter g. Naturally the anonymous letter-writer didn’t want to give away the fact that she hadn’t had enough education to know the difference.’

‘Well worked out, Frederick, well worked out,’ said the Inspector, most interested. ‘What about this?’ He held up the copybook.

‘That’s easy, sir,’ said Fatty. ‘Even Bets could read that clue now!’

‘Yes, I can!’ called Bets. ‘That’s a copybook Mrs. Moon must have bought to practise writing capital letters in. There’s lots of capitals printed there in pencil.’

‘I expect if you ask at the stationer’s, Inspector, you’ll find that Mrs. Moon did buy a copybook there some weeks ago!’

‘Make inquiries, Goon,’ said the Inspector. Goon hurriedly made a note in his notebook.

‘The bus time-table was an easy clue,’ said Fatty. ‘I guessed I’d find that 10.15 bus marked. And this bit of torn paper, sir - used as a bookmark in the dictionary, I should think - must have been torn from a recipe of some sort. I knew that as soon as I read the words - “spoonful” - “stir” - “oven”. I expect you will find that they are in Mrs. Moon’s ordinary handwriting, and torn from her kitchen recipe-book.’

‘A most ingenious reading of rather peculiar clues!’ said the Inspector, looking really pleased. ‘What a pity, Mr. Goon, you didn’t take the trouble to look carefully through the clues yourself, and deduct from them all that Frederick has done.’

‘Thought they was all false clues,’ muttered Mr. Goon. ‘Made me angry, they did.’

‘It’s a mistake to let anger cloud your thinking, Goon,’ said the Inspector. ‘If you had only examined these clues carefully, you might have arrived at the same conclusions as Frederick here - but again, you might not!’

It was apparent that the Inspector believed that Goon would certainly not have made such good use of the clues as Fatty had!

Mrs. Moon suddenly threw her apron over her head and wailed loudly. She rocked to and fro again, and Bets watched her in dismay. She didn’t like people who shouted and howled.

‘You’re all against me, you are!’ wailed Mrs. Moon. ‘Not a friend have I got in the world! You’re all against me!’

‘You have only yourself to blame, my good woman,’ said Inspector Jenks sharply. ‘You yourself are apparently filled with spite against a great many people - and you cannot be surprised if you have no friends. I’m afraid you must come with me for further questioning. Mrs. Hilton, I fear that Mrs. Moon will not be returning to you.’