CHAPTER XX 

BACK IN CAMP 

"What's this you are saying, Link?" demanded Phil, who had overheard the conversation just recorded. "You ought to be ashamed of yourself to talk that way. Just because Dave spent part of his life in the poorhouse after he was stolen away from his parents is no reason why you should speak as you do." 

"And that isn't the reason why I am talking this way," retorted the prisoner. "I've got another reason, and Dave Porter will find out what it is before very long." 

"You just said that I was not Dave Porter," remarked our hero. "What do you mean by that?" 

"Never mind what I mean; you'll find out sooner or later," answered Link, with an expression of cunning on his countenance. 

"Oh, don't listen to him!" broke in Roger; "he is only trying to worry you, Dave. Let us get back to the bungalows and tell Mr. Wadsworth about this capture." 

"I'm not going back with you," retorted Link Merwell. And now, with his hands tied behind him, he made a leap over the rocks in the direction of the woods. 

The sudden movement on the part of the prisoner, surrounded as he was by all of the boys, came somewhat as a surprise. But Dave, Roger and Phil were quick to recover, and away they bounded in pursuit of the fleeing one. 

Terror lent speed to Link Merwell's feet, and soon he gained the edge of the growth, which at this point was quite heavy. 
What kind of expression did he have?
cunning 