Carolyn Keene
68) Pit of vipers
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Nancy's good friend, Charlie, appears to be guilty of snake-napping from the River Heights Zoo. Meanwhile, George's brother, Scott, is being very sneaky and not acting like himself. Can these things be related? Nancy is about to find out.
73) The twin dilemma
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When a model disappears, Nancy takes her place in a benefit fashion show and helps to track down a dress thief.
75) The swami's ring
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When an amnesia victim appears in River Heights with a royal Hindu ring in his possession, Nancy Drew is called in to help learn his identity.
77) The triple hoax
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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.
79) Secret cargo
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Nancy Drew and the Hardy brothers run into danger when they try to prevent the sabotage of an anti-pollution campaign. The reader controls the outcome of the story by choosing different ways of advancing the plot.
80) Captive witness
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Description
Trouble plagues a student tour through Europe as Nancy becomes involved in a plot to smuggle refugee children across the Austrian border from Eastern Europe.