Carolyn Keene
49) The sky phantom
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While vacationing in the Midwest with her friends, Nancy Drew investigates a mysterious magnetic cloud, searches for a hijacked plane, and hunts a horse thief.
54) Deadly doubles
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Summary: Nancy Drew, who must stop a group of international terrorists from assassinating their American political enemies, finds a clue to the group's plan on a tennis court.
57) Buried secrets
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After saving the life of a handsome young candidate from a sniper's bullet, Nancy investigates the unsolved death of the candidate's father, who was mayor many years ago.