The Nancy Drew Mystery Files #64: Captive Witness (1981)
Emerson College planned a summer trip across Europe, and somehow Nancy and the girls got an invite. Along with Ned, they head across eastern Europe with Professor Bagley, his assistant Eric, who is in a wheelchair, and some other random kids. Nancy gets a telegram from her dad because one of his clients needs her help. Kessler is an immigrant East Germany and an award winning film director. He recently made a documentary about his life before leaving Germany, but someone stole it from the film festival, so Nancy agrees to check things out. After arriving at the airport, a random porter steals the professor's bags and runs off. Ned and his friends give chase, but Nancy actually catches him. He threatens her before disappearing. They board a bus to Austria, but the driver acts really gruff. When Bess hears a knocking noise coming from under the bus, he claims it's just some loose tools. At a random stop, Nancy sees him take something off the engine and throw it in t