Nancy and her friends travel to New York at her Aunt Eloise's request to investigate a group of Hoaxters who have swindled her aunt's friend out of a considerable sum of money, and soon find themselves hunting down the thieves in Mexico City and Los Angeles.
Nancy investigates the connection between a harpist, a planned boycott of the River Heights Summer Music Festival, and a mysterious ring found in the knapsack of an unknown amnesia victim.
While staying at the Gourmet Getaway, a resort in Massachusetts' Berkshire mountains, Nancy and her friends, Beth, George, and Hannah, investigate the mysterious series of events that threaten to sabotage the resort's grand opening.
Nancy Drew and friends Bess and George track a group of swindlers and kidnappers from New York to Mexico City to Los Angeles where they finally solve the mystery of the Triple Hoax.