In the Teeth of the Evidence by Dorothy L. Sayers Page B

where’s the man who found the body? What’s your name? Ted Baggitt? Very well, Baggitt, what do you know about this?’
        ‘Nothing at all, sir – only the finding him. I come on duty, sir, when the man on the gate goes off at half-past seven. Mr Robbins had left the Mills when I came on, but about a quarter to eight, back he comes again. He lets himself in with his own key and meets me just outside the door. “I’ve come up to do a bit o’ private work,” he says, “and Mr Edgar may come along later, but don’t you bother,” he says, “I’ll let him in myself.” So I leaves him in this here office and goes off to get me bit o’ supper ready. My little room’s down in the other building.’
        ‘And did Mr Edgar come?’
        ‘Yes, sir. Leastways, the outer bell rang about 8 o’clock, but I didn’t take no notice, seeing what Mr Robbins said. I didn’t hear nothing more, sir, nor see nobody, till I’d ’ad me supper and come out this way to start me first round just about 9 o’clock. Then I see this ’ere door open, and I looks in, and there’s poor Mr Robbins a-laying dead. So I says, “O Gawd~!” I says to myself, “we’ll all be murdered.” And I takes to me ’eels.’
        ‘You never actually saw Mr Edgar?’
        ‘No, sir.’ The man’s face looked troubled. ‘No, sir – I never see ’im. You don’t think it could have been ’im, sir? That would be an awful thing, to be sure.’
        ‘Mr Edgar?’ cried Mr Bowler, in horror. ‘But you was there yourself, sir, when he said he wasn’t coming to the Mills.’
        ‘Yes,’ said the Chief Constable. ‘Of course, he might have wanted us to think just that. It would be a very bold way to stage an alibi, but it’s possible. Still, at present we’ve no proof that he did come. Well, Doctor, what about it?’
        ‘Dead about an hour to an hour and a half,’ replied Dr Small. ‘Struck with a heavy instrument with sharp edges. A paper-weight, did you say, Mr Harcourt? Yes, it might well be something like that.’
     

     
        ‘What’s that?’ asked Charteris. And when the banker had explained:
        ‘I see. Weybridge, tell them to have a look round for the weapon. It may have been thrown away somewhere. Be careful of any possible finger-prints. Anything else, Doctor?’
        ‘His keys are in his pocket, so the murderer didn’t use them to let himself out. And here’s part of a letter, tightly clenched in his left hand.’
        The doctor spread the crumpled scrap of paper carefully out on the desk. The message was written in block capitals, in purple copying-pencil.
        The Chief Constable and Mr Montague Egg looked at the paper and then at one another.
        ‘The envelope that was handed to Mr Robbins tonight at the Eagle,’ said Mr Egg, softly, ‘was addressed in block capitals, in purple copying-pencil.’
        ‘Yes,’ said Charteris. ‘And I think we may take it that this is it.’
        ‘H’m!’ said Inspector Weybridge. ‘And there ain’t much doubt who wrote it, sorry as I am to say it. It’s what I’d call an easy dockiment to reconstruct. “I’m a better player than Benson, and I deserve by rights to be put in goal. I want fair play and I mean to get it. I shall call at (or come to) your house tonight, at 8 o’clock” – Well, it don’t say tonight, actually, but it do say 8 o’clock – and then there’s “and if” at the end – looking like a threat might be coming. Has anybody seen Hughie Searle about tonight?’
        Only too many people had seen Hughie Searle, and heard what he had to say.
        ‘And to think,’ murmured Mr Bowles, ‘that it was me told him where to find Mr Robbins. If I’d a-kept my fat head shut, he’d a-gone up to the house, like it says in the letter, and nobody wouldn’t have been able to tell him anything. Except Mr Edgar. Gosh!’ added the landlord, ‘of course – that’s why Mr Robbins changed his mind