The Haunted Showboat is the thirty-fifth book in the Nancy Drew mystery series. It was first published in 1957 under the pseudonym Carolyn Keene.The Haunted Showboat at WorldCat The actual author was ghostwriter Harriet Stratemeyer Adams.
Plot
Nancy, Bess, and George travel to New Orleans for Mardi Gras, but they are then enveloped into a mystery involving an old showboat that is said to be haunted. Nancy then uncovers an imposter and searches for buried pirate gold.
References
See also Mardi Gras in New Orleans