The three investigators, aided by their friend Allie, try to untangle the unusual circumstances surrounding an abandoned silver mine.
Series
43 primary booksAlfred Hitchcock and The Three Investigators is a 43-book series with 43 released primary works first released in 1964 with contributions by Robert Arthur, Alfred Hitchcock, and Jens Wawrczeck.
Series
49 primary booksDie drei Fragezeichen (Original) is a 49-book series with 49 released primary works first released in 1964 with contributions by Robert Arthur, William Arden, and Alfred Hitchcock.
Series
99 primary booksDie drei Fragezeichen (Hörspiele) is a 99-book series with 99 released primary works first released in 1964 with contributions by Robert Arthur, Alfred Hitchcock, and Jens Wawrczeck.
Series
9 primary books10 released books3 Penyiasat is a 10-book series with 10 released primary works first released in 1965 with contributions by Robert Arthur, Alfred Hitchcock, and William Arden.
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