ssent.

Declining Mrs. MacAlister's invitation to stay to tea, they trooped out
of the post-office.

'We'll watch that man,' said Reggie, and Tricksy began to walk on the
tips of her toes in anticipation.

'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
re