Nancy Drew: Mystery of the Diamond Triangle (1978)

Genres - Mystery  |   Run Time - 47 min.  |  
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Nancy Drew, teenage crime-solver, found mysteries to unravel in all of her adventures on her 1977 Sunday-evening series, which was based on a children's novel series of the same name. In "Mystery of the Diamond Triangle," Nancy, while soaring on a glider, witnesses a car sliding off the road. However, when she reaches the ground, she discovers that the police can't find the vehicle.