1981 Random House editions Alfred Hitchcock The Three Investigators book box set. Contains 6. The Secret Skeleton Island 10. The Mystery of the Moaning Cave 18. The Mystery of the Shrinking House 26. The Mystery of the Headless Horse 27. The Mystery of the Magic Circle Still in very good condition. Bindings are tight and there are no marks. The only thing to note is that there is an area on the box where a sticker has been removed.
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