"And you think we have a chance?"
"I don't see why not," replied Tom. "We've been off duty long enough. I'd like to get back behind the propeller again, and with a drum or two of bullets to use in case we sight a Hun plane. Let's go and send word to our captain that we've had enough of leave, and want to go out again."
"All right. But what about your father?"
"Well, I don't know what to say," answered Tom. "I'm about convinced that he wasn't killed, or even hurt, in any of the bombardments of Paris. But where he is I don't know. I guess, as a matter of duty to France, I'll have to let my private affairs go and—"
At that instant there sounded an explosion the character of which the two boys well knew by this time.
"The big gun again!" cried Jack.
"Yes, and they're firing after dark!" added Tom. "This may be just the chance the airmen have been waiting for—to locate the piece by the flashes. Come on out and see what's doing!"
Together they rushed from their room.
