[S]uddenly a great uproar broke out at the far side of the big hall and a tall fair young man burst into view and came running towards the girls, hotly pursued by two rather stout porters, in blue smocks, who were shouting and waving their arms.
Ricky's bright blue eyes blazed with excitement. "Here's something at last!" she muttered. "He's running away! He's a crook! He must have robbed a bank or something! Look, the wee fat porter is yelling and shaking his fists! They're yelling Stop thief!"
"As they seem to be yelling in a foreign language," murmured Fay, calm as ever, "I don't see how you can be sure of that."
"Of course I'm sure! It's as plain as the nose on your face. Oh help, what'll we do? We must do something! We must stop him! What'll we - oh help - should we - should I - oh help--"
She took an uncertain step towards the fleeing young man and two very uncertain steps back again as the young man nearly knocked her down as he flashed past. But Julie, who had very little patience with all this shilly-shallying, muttered, "Oh, stop dithering, Ricky," and flung herself straight at the young man's legs.
From CROOKS TOUR, Chapter 2, Crook in the Station.