The Three Investigators and the Time Traveler

What is the story behind Quentin Kurtz's secret time-travel experiment? Why were he and his daughter Aurora sought by the CIA? And where did they both disappear to without a trace more than 30 years ago? As the Three ??? take on this mysterious case, the laws of logic seem to cease to apply: because suddenly the long-lost Aurora stands before them in the flesh - without having aged a single day ...

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