Louise held her watch so that she could read the figures in the bright moonlight and observed that it was only a quarter past ten.

“Anyway, we should be starting for home,” Penny said. “Coming about!”

Louise prepared to lower her head as the boom swung over, but to her surprise the maneuver was not carried through. Instead of turning, the dinghy kept steadily on its course.

“What’s the idea?” she demanded. “Isn’t there enough breeze to carry us around?”

“I was watching that light up on the hill,” Penny explained.

Louise twisted in the seat to look over her shoulder.

“What light, Penny?”

“It’s gone now, but I saw it an instant ago. There it is again!”

Unmistakably, both girls saw the moving light far up the hill. As they watched, it seemed to approach the dark Marborough house, and then receded.

“Probably someone with a lantern,” Louise remarked indifferently.