"I'm quite all right," she declared. "I am enjoying it. How much farther is it, do you think?"
It was Rollo's turn to shake his head. He did not know, and he was too candid to pretend that he did.
"We ought to be meeting shipping in and out of the Thames estuary shortly," he said. "I suppose our merchant vessels sail as freely as they did before the war? Hello! There's something coming up astern."
He pointed to a faint blurr of smoke about three miles away and dead in the wake of the motor-boat.
"Something fairly fast to be able to overtake us," remarked Thelma. "Is there a telescope on board?"
"I'll see," answered Rollo.
Again he entered the cabin. Kenneth was still sound asleep. Yvonne was seated on the opposite bunk, watching him as zealously as a vigilant sentry.
"What are you looking for, Rollo?" she whispered.
"A telescope."
She arose and, steadying herself by means of the cabin table, made her way to the for'ard bulkhead. Drawing back a curtain, she took down the required article from a rack.