"Hush, Helen!" commanded Ann.
"But he's going right to the cave—and he carried a gun."
"I didn't see the gun," whispered Ann.
"I did," agreed Bob, squeezing Helen's arm. "It was a rifle. Do you suppose there is any danger?"
"It couldn't be anybody hunting us, do you suppose?" queried Helen, in a shaken voice. "Anybody from the house?"
"Preston!" exclaimed Ann.
"How would he know the way to get into this tunnel?" returned Bob. "Come on! let's spy on him. I'm worried now about Tom and the others."
"You don't suppose anything has happened to Ruthie?" whispered Helen. "Oh! you don't believe that, Bobbins?"
"Come on!" grunted the big fellow, and took the advance.
They were careful of their own footsteps over the loose stones. The person ahead acted as though he had an idea he was alone.