THE DOUBLE JINX MYSTERY
A bird of ill omen is mysteriously left on Nancy's front lawn. Did the person who put it there do so with the intent of jinxing Nancy and her father? This strange incident involves Nancy in one of Carson's cases about a rare bird farm threatened with destruction to make room for a high-rise apartment house complex. The use of jinxes to threaten those who oppose the construction leads Nancy to track down the criminals behind the jinxing.