This one is." All the windows proved to be fastened.
"We don't want to break any glass," said Tom Reade ruefully.

"We might have a big freeze around here, and then we'd appreciate window glass." Here was a poser, indeed.
"There doesn't seem to be any keyhole, and yet the door is locked," muttered Dick, studying the door.

"Hold on! What's this string for ?" He took hold of a cord that appeared to run through the wooden barrier.
Giving the cord a hard pull, Dick once more pushed against the door.

It yielded and swung open.
"Hurrah!" sounded the chorus.
"We're bright ones," laughed Dick.

"Thought we knew a lot about log cabins, and we clean, plumb forgot the latch-string." "Let's get inside and get warm," begged Dan.
"Let's get warm by tumbling the things off the wagon," dissented Prescott.