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 waiting-room at Victoria Station, where she had heard all the story.

'Now,' said Darnell, when the table had been cleared, 'tell us all about it. How long has it been going on?'

'Aunt thinks now, from little things she remembers, that it must have been going on for a year at least. She says there has been a horrid kind of mystery about uncle's behaviour for a long time, and her nerves were quite shaken, as she thought he must be involved with Anarchists, or something dreadful of the sort.'

'What on earth made her think that?'

'Well, you see, once or twice when she was out walking with her husband, she has been startled by whistles, which seemed to follow them everywhere. You know there are some nice country walks at Barnet, and one in particular, in the fields near Totteridge, that uncle and aunt rather made a point of going to on fine Sunday evenings. Of course, this was not the first thing she noticed, but, at the time, it made a great impression on her mind; she could hardly get a wink of sleep for weeks and weeks.'

'Whistling?' said Darnell. 'I don't quite understand. Why should she be frightened by whistling?'

'I'll tell you. The first time it happened was one Sunday in last May. Aunt had a fancy they were being followed a Sunday or two before, but she didn't see or hear anything, except a sort of crackling noise in the hedge. But this particular Sunday they had hardly got through the stile into the fields, when she heard a peculiar kind of low whistle. She took no notice, thinking it was no concern of hers or her husband's, but as they went on she heard it again, and then again, and