“Got the key?” Fido asked.

“Do you suppose I’d come away without it?”

“Pull a little on your left.  I can just make out the shed.  There isn’t,—­yes there is, there’s just one light in the town.”

“That’s Algernon Kirkendall studying his algebra,” said Nick.

“It’s just in line with the shed.  Row straight for the light and we’ll hit the shore just right.  I’ll lift this seat and steer with it.  Crinkums, it’s dark on the water, isn’t it?”

So the algebra was of some use in the world after all; Algernon Kirkendall was a scout without knowing it.

“S.N.[1] thinks more of that new car than he does of the troop,” said Fido.

“Sure, the car don’t give him as much trouble,” said Nick.  “We’re a Hunkajunk troop and Safety First’s troop is a Ford troop; it’s small but it makes a lot of noise.  If I ever start a troop it will be air-cooled.  How about it, am I headed right?”

[Footnote 1:  Scoutmaster Ned he meant.]

“Row straight ahead, I’ll steer.”

“Golly, the water’s black.  Look!  Did you see that fish jump?  Look around, the camp-fire looks good from here.  Believe me, the autumn is the time to camp.  We’re in luck.  I love, I love, I love my lessons, but oh you little island!”

“Ditto.”

“We’re set till Columbus Day.”

“You mean Election Day.  Gee, your oar touched bottom, here we are.  I’ll row back.”

They pulled the boat up and started for the shack.  Fido reached it first and called excitedly, “It’s open!  The car’s gone!”

“Stop your fooling,” called Nick.

“I’m not fooling, come and look for yourself, hurry up, the car’s gone.”

They stood in the big open doorway in gaping amazement.  They walked in, too dumfounded to speak, and when they did speak their voices sounded strange to each other within the dark, empty confines of those old dried board walls.

“Somebody must have broken in through the small door,” said Fido.

“It’s closed and locked,” said his companion.  “How about the fastening on the big one?”

“It’s all O.K.; nobody’s been breaking in, that’s sure.”

“You don’t mean to tell me S.N. would lock the small door and then come away leaving the big one open, do you?” Nick asked incredulously.

“Well, what then?” his comrade retorted with greater incredulity.  “If both doors were closed and fastenings are all right now, could anybody get the car out?  They left the big door open—­that’s what they did.”

“They never did that,” said Nick; “look here, here’s a fresh finger print on the door—­you can smell the oil on it.  Here, wait till I light another match.  S.N. did what he always does, he opened the hood and turned on the oil pet-cock and fussed around and then pulled the door shut.  Someone must have been inside this place before they got back.”

Fido Norton was by this time on his knees outside the larger door.  “Here are footprints,” said he; “two, three,—­here’s another one.  Give me another match.”