"The Double Jinx Mystery" by Carolyn Keene (Nancy Drew Mysteries #50)

A bird of ill omen is mysteriously left on the Drews’ 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 her famous father’s case concerning a rare bird farm threatened with destruction to make room for a high-rise apartment house complex. People who are opposed to the ruthless takeover of the farm are being made the victims of jinxing by bad luck symbols and other threats to their safety. Even Nancy and her friend Ned Nickerson become targets!

Nancy soon realizes that helping honest people overcome their superstitions and fears can be as challenging as tracking down criminals. The young detective’s thrilling adventures will keep the reader in breathless suspense from the first page to the last.