"I'll help," spoke Aunt Kate. "That's a very sensible idea."

"I think that is the dock light," remarked Betty a little later, when
the boat was headed up stream.

"Anyhow, we can't be very far from it," observed Grace. "Try that
one," and she pointed to a gleam that came across the waters. "Then
there's another just above."

The first light did not prove to be the one on the private dock where
they had been tied up, but the second attempt to locate it was
successful, and soon they were back where they had been before. Betty
laid the Gem alongside the stringpiece, and Grace and Mollie, leaping
out, soon had the boat fast. The ends of the ropes, which had been
trailing from the deck cleats in the water, were found unfrayed.

"They must have come untied!" said Grace. "Oh, it was my fault. I
thought I had mastered those knots, but I must have tied the wrong
kind."

"Never mind," said Betty, gently.

CHAPTER XII

AT RAINBOW LAKE

Once the Gem was securely tied-- and Betty now made sure of this-- the
tired and rather chilly girls adjourned to the cabin, and under the
lights had the hot chocolate Aunt Kate and Amy had made.