"Her sails must surely be lit up in that way by electricity"--said
Dr. Brayle, who had been watching her attentively--"But how it is
done and why, is rather puzzling! I never saw anything quite to
resemble it."

"She came into the loch like a flash,"--said Captain Derrick--"I saw
her slide in round the point, and then without a sound of any kind,
there she was, safe anchored before you could whistle. She behaved
in just the same way when we first sighted her off Mull."

I listened to what they were saying, impatiently wondering what
would be the end of their surmises and speculations.

"Why not exchange courtesies?" I said, suddenly,--"Here we are--two
yachts anchored near each other in a lonely lake,--why should we not
know each other? Then all the mysteries you are talking about would
be cleared up."

"Quite true!" said Mr. Harland, breaking his silence at last--"But
isn't it rather late to pay a call? What time is it?"

"About half-past ten,"--answered Dr. Brayle, glancing at his watch.

"Oh, let us get to bed!" murmured Miss Catherine, pleadingly--
"What's the good of making any enquiries to-night?"

"Well, if you don't make them to-night ten to one you won't have the
chance to-morrow!"--said Captain Derrick, bluntly--"That yacht will
repeat her former manoeuvres and vanish at sunrise."