'Hulloa, young people, glad I've overtaken you,' said the doctor's voice behind them. 'It's just going to pour with rain, and you're due at my house to tea, I believe. It's lucky I have the closed carriage; jump in as many of you as it will hold, and the rest of you can sit on the box.' By the time the doctor's house was reached the rain had stopped, and the sun was peeping out again. A scrap of white paper fluttering on the ruins attracted Reggie's attention, and he ran across the garden, climbed the wall, and captured it. After looking at it he gave a violent start, then ran towards the house. 'It's a postal order,' he said, giving it to the doctor; 'what's the meaning of this?' All clustered round, and the doctor took the piece of paper and examined it. 'Strange thing,' he exclaimed; 'this order bears the number of one of those that went missing on the night of the robbery. How did it come there? It's wet with the rain, but not very dirty; probably hasn't been there long. This ought to shed some fresh light upon the case. I'll have the police to make a thorough search of the ruins.' CHAPTER VI A DISCOVERY 'Reggie,' said Allan, 'there they are at last.' Reggie slid down from the garden wall, looked towards the road, and said, 'Where?' 'They're behind that hill now. They'll be here in no time. You'd better call Tricksy, and tell her to be ready.' Reggie went into the house, and called, standing at the foot of the staircase, 'Tricksy, it's Graham major and Graham minor with their Pater; and they're almost here.' Tricksy came downstairs and waited in the hall, somewhat shyly, beside her brothers. 'Oh, I do hope they will be nice,' she whispered apprehensively to Reggie, as the dog-cart drew up at the door. A tall pleasant-faced gentleman was beside the driver, and two boys were on the back seat wrapped in Inverness capes, and with caps drawn over their brows as a protection against the wind. As Mr. and Mrs. Stewart were receiving their guests in the hall, Reggie and Tricksy had an opportunity of observing the boys. One was dark, about twelve years of age; thin, alert, with bright, restless hazel eyes; and the other was about as old as Reggie, with blue eyes and reddish-golden hair; almost too pretty to be a boy, Reggie thought; while Tricksy said to herself that he looked rather "nice."' After greeting the grown-up folk, the new-comers turned to encounter Tricksy's solemn, dark eyes and Reggie's bright, twinkling ones. Tricksy shook hands very shyly, and Reggie a little stiffly; then the visitors were taken upstairs to prepare for lunch. Tricksy turned to Reggie, whose countenance wore a non-committal expression; then she looked at Allan and heaved a little sigh. 'What do you think of them, Tricksy?' inquired Allan. 'Well, I think the little one looks rather nice, but the other is a little proud.' 'Do you think they'd care about our Pirates' Island, and all that?' asked Reggie doubtfully.