The Mysterious Mannequin is the forty-seventh volume in the Nancy Drew Mystery Stories series. It was first published in 1970 under the pseudonym Carolyn Keene. The actual author was a ghostwriter following a plot outlined by Harriet Stratemeyer Adams, heir to the Stratemeyer Syndicate.

Plot

The strange disappearance of Carson Drew's Turkish client and a strange gift of an oriental rug encoded with a message woven in the decorative border start Nancy on a difficult search for a missing mannequin. But then, a robber tries to steal the rug from the Drew home. Nancy, Bess, George, Ned, Burt, Carson, and Dave travel to Istanbul to search for more clues. Bess disappears during the search after the chums meet a young Turkish woman.