World-famous duck-tective Miss Mallard must thwart a thief in this mystery that launches QUIX, a new line of fun-to-read short chapter books that are perfect for emerging readers. A runaway horse and a mysterious ranch in the Texas prairie have the intrepid Miss Millard on the trail of a plot to steal priceless artifacts! Bestselling author Robert Quackenbush's super-sleuth is on the case to solve the latest mystery!