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Nancy Drew, girl detective, takes her friends into the woods to investigate some mysterious lights and becomes caught up in a quest to find an engine abandoned in an old warehouse after World War II that reportedly can get two hundred miles per gallon of fuel.

Nancy Drew is trapped inside a large estate with Gregor, a man rumored to be a vampire who really just has a rare skin disease that prevents him from going out during the day, and a woman who is certain Gregor is a vampire and believes she must destroy him.

"Has Nancy Drew solved the world's energy crisis? On a mission sponsored by young, rich, and handsome Ralph Credo, Nancy teams up with eccentric scientist Roy Hinkley to find an amazing high efficiency engine able to operate at an unbelievable 200 miles per gallon! The prototype engine, mounted on a tank, was part of an experiment during the final days of World War II.