‘And how nobody posted any that day - except me! - and I expect, like us, he made inquiries to see if any of the regular bus-passengers failed to go on the bus that day for some reason or other - and got his Suspects narrowed down to Old Nosey, Miss Tittle, and Mrs. Moon.’
‘Yes. He did tell me,’ said the Inspector. ‘And I think, if I may say so, that it was pretty smart work on the part of you children to work all that out!’
This was too much for Mr. Goon. ‘Smart work! Interfering with the Law, that’s what I call it!’ he said. ‘I suppose he’ll tell you next that he knows who that letter-writer is!’
‘Yes. I was going to come to that,’ said Fatty quietly. ‘I do know who the letter-writer is!’
Every one gaped at Fatty. Even the Inspector sat up straight at once. As for Goon, his mouth fell open and he goggled at Fatty in disbelief.
‘Who is it?’ he said.
‘Mrs. Hilton - may I ring the bell?’ said Fatty.
She nodded. He went over to the wall and rang the bell hard. Everyone waited.
WELL DONE, FATTY!
The bell sounded loudly. The door opened in the kitchen and footsteps came up the hall. Mrs. Moon appeared in the drawing-room. She looked surprised and rather scared when she saw so many people sitting quietly there.