"It's only Jo and me," came Sadie's voice. "We heard you, and thought maybe you were sick. Are you?"
"No. But come here and look at this!"
She pointed from the window to the motor boat, which was clearly visible upon the moonlit water. As the other girls peered curiously over Nan's shoulder, two men jumped up on the dock. One of them disappeared about the corner of the boathouse, the other made hurriedly for the gymnasium.
"The thieves!" cried Jo. "We've seen them at last!"
The three girls hurried out into the corridor to get a better view from a window there than any of their own afforded.
"Wait a minute! Look!" Sadie was shaking with excitement. "That man has come out of the gym and he's heading for the garage! He is opening the door!"
"Miss Jane's sedan! He's stealing Miss Jane's car!" cried Nan. "Come on, girls, quick! We've got to give the alarm!"
But Jo caught her arm.
"Look over there! That light from the gym!" she gasped. "Girls, the gym is on fire!"