‘Well - things like you-know-what,’ said Fatty, going all mysterious. ‘I know you’re going to set to work on that little matter, Mr. Goon, and I wish you luck. I hope, for poor Gladys’s sake, you’ll soon get to the bottom of the matter.’

This was quite a shot in the dark, but it seemed to surprise Mr. Goon very much. He blinked at Fatty out of his bulging frog-eyes.

‘Who told you about that there letter!’ he suddenly said.

‘Oho,’ thought Fatty, ‘so it’s something to do with a letter!’ He spoke aloud.

‘Ah, I have ways and means of finding out these things, Mr. Goon. We’d like to help you if we can.’

Mr. Goon suddenly lost his temper, and his face went brick-red. ‘I don’t want none of your help!’ he shouted. ‘I’ve had enough of it! Help? Interference is what I calls it! Can’t I manage a case on my own without all you children butting in? You keep out of it! Mrs. Hilton, she promised me she wouldn’t say nothing to any of you, no, nor show you that letter either. She didn’t want you poking your noses in no more than I did. Anyway, this is a case for the police not for little busy-bodies like you! Clear-orf now, and don’t let me see you messing about any more.’

‘I thought perhaps you would like your glove, Mr. Goon,’ said Fatty politely, and he held out the policeman’s big glove. ‘You left it behind you yesterday.’

Mr. Goon snatched at it angrily. Buster growled. ‘You and that dog of yours!’ muttered Mr. Goon. ‘Tired to death of both of you I am. Clear-orf!’

Fatty cleared off. He was pleased with the result of his interview with Mr. Goon, but very puzzled. Mr. Goon had given a few things away - about that letter, for instance. But what letter? What could have been in a letter to cause this mystery? Was it something to do with Gladys? Was it her letter?

Puzzling out all these things Fatty cycled back to the others. He soon told them what he had learnt.