“Saw a gleam of it when they were getting into the boat.”
“Yes; but it may have been left on the vessel.”
“No; I’m sure I caught a flicker after the boat started.”
“Well, what sort of a light is it if we can’t see it now?”
“Dark lantern.”
“Eh? Great Scott!”
All the boys, with the exception of Merry, gave a start. Why should the men in the boat carry a dark lantern?
Rattleton, Browning, Diamond, all three of them, flung the question at Frank.
“I don’t know,” confessed Merry; “but it is a part of the mystery.”
It added to the keen interest with which the boys awaited the approach of the boat.