“Do you know what has been done to it?” asked Harriet.

“I think so,” nodded Jane.

“The rope has been cut,” reflected Harriet.

“It has,” agreed Jane.

“But, who could have done such a thing?” Harriet wondered.

“If I knew, I’d make him suffer for this piece of work,” retorted Jane.

“I don’t know; I can’t even think,” answered Harriet solemnly.  “What do you suppose has become of the boat, Jane?”

“Goodness knows,” replied Jane.

“I’m going to search the lake.”  Harriet ran around the end of the pier, where, shoving off the rowboat, she leaped in.  Jane followed her.  “I’m going to the west.  The wind is blowing that way.”

Jane McCarthy nodded understandingly.  Harriet was rowing, Jane sitting in the stern of the boat.

“Watch the shore, Jane.  I will do the rowing.  I am going to tell you what I discovered that day we first went aboard the houseboat.  I put my hand on the stove quite by accident that morning.  The stove was so hot that it burned my hand.”

“You don’t say?”

“Yes.  Now explain how that stove happened to be hot,” continued Harriet.

“That’s easy.  Somebody had had a fire in it,” nodded Jane.

“Exactly.  And not long before we went aboard.  Then there were bread crumbs on the floor.  Jane, some person had been living on that boat.  You remember how anxious Dee Dickinson was that we should not go to the boat until he had first been there?”

“Yes, but what has that to do with the cutting of the rope, last night, and losing the boat?”

“I don’t know.  That the two puzzles have some connection I am positive.  What we wish most, just now, is to find the ‘Red Rover.’”

“There’s something red on the shore; it looks like a fire!” cried Jane, pointing excitedly.  “Oh, if it should be the boat.”

Harriet ceased rowing and quickly turned her head over her right shoulder.  She gazed, at first half startled, then uttered a cry of delight.

“It’s the ‘Red Rover.’  Don’t you see?  Hurrah!  We’ve found the boat.  It’s the sun shining on those red sides that made it look like a fire.”

Harriet swung the prow of the boat and began rowing shoreward with all her might.  After a few minutes of rowing she drove the boat in alongside of the “Red Rover,” then leaped out on the shore.  The unknown miscreant having cut her from her moorings the houseboat had drifted down the lake.  She had stranded among a forest of rushes, the bottom of the boat being hard and fast on the gravel.

The girls breathless with excitement, climbed aboard.  The after-half of the house floor was under water.  There were fully two feet of water in the stern.  In the after cockpit were several bushels of sand and gravel that had been thrown up by the wind and waves during the night.

“Oh, the villains, to do a thing like this!” raged Jane.  She started to run aft for a pail but losing her footing on the slippery floor she went sprawling and splashing into the water.  Jane scrambled up, wet from head to feet.