"This is absurd!" burst out Lorraine. "We came to get a few ferns, that's all. They're wild, and surely taking a root or two isn't an offence against the realm?"

"You've been found in a forbidden area in a military zone," returned the special constable pompously. "I'm stationed here to guard the tunnel, and I shall report you. If you don't give me your names and addresses, I shall have to arrest you."

Very unwillingly the Forresters complied, and watched the incriminating details being jotted down in an official notebook.

"Our father is a town councillor," ventured Lorraine, hoping for vicarious favour.

"That makes it so much the worse, for you ought to know better," was the uncompromising reply. "Take yourselves off at once, and mind you never come trespassing here again!"

Crestfallen, but trying to preserve the family dignity, the Forresters beat a retreat. They scorned to run, and walked leisurely up the bank, while the special constable covered them with his eye. Monica had an uneasy suspicion that they might also be covered with a revolver, and, though she would not for worlds have shown a qualm of fear before Mervyn, she was nevertheless considerably relieved when she found herself upon the safe side of the fence.

"Strafe the old chap and his jaw-wag!" exploded Mervyn. "A nice mess he's got us into with his fussy interference!"

"Do you think he'll really report us?" asked Lorraine anxiously.

Her spirits were down at zero. Her father was strict, and would be very angry with them for getting into trouble. A scene at home loomed large on the horizon. In imagination she saw the affair reported in the local newspaper. A nice position truly for the head girl at The Gables to begin the new term by covering herself with disgrace.

Mervyn strode along whistling with amused sang-froid, but inwardly absorbed in unpleasant contemplation. Monica clutched the fern basket half-defiantly.