nancy is asked to solve a puzzling mystery then encounters a second case the first concerns a valuable collection of rare books wealthy mrs merriam has commissioned a supposedly reputable art dealer to sell it but soon believes the man is a swindler the second mystery involves the theft of a beautiful marble statue rumored to whisper has an uncanny resemblance to nancy as suddenly as it disappeared the marble statue is returned and is discovered to be a reproduction to solve both mysteries nancy adopts an alias and a disguise becomes an employee of the suspicious dealer gathering evidence against a clever ring of art thieves this book is the revised text the plot of the original story 1937 is different